diff --git a/app/pairing.py b/app/pairing.py
index 60a6a170..15b24d12 100644
--- a/app/pairing.py
+++ b/app/pairing.py
@@ -4,9 +4,6 @@
 
 from logging import getLogger as _Logger
 
-from receiver import DeviceInfo as _DeviceInfo
-from logitech.devices.constants import (STATUS, NAMES)
-
 _l = _Logger('pairing')
 
 
@@ -70,31 +67,8 @@ class State(object):
 
 		_l.debug("event for new device? %s", event)
 		if event.code == 0x10 and event.data[0:2] == b'\x41\x04':
-			state_code = ord(event.data[2:3]) & 0xF0
-			state = STATUS.UNAVAILABLE if state_code == 0x60 else \
-					STATUS.CONNECTED if state_code == 0xA0 else \
-					STATUS.CONNECTED if state_code == 0x20 else \
-					None
-			if state is None:
-				_l.warn("don't know how to handle status 0x%02x: %s", state_code, event)
-			elif event.devnumber < 1 or event.devnumber > self.max_devices:
-				_l.warn("got event for invalid device number %d: %s", event.devnumber, event)
-			else:
-				dev = _DeviceInfo(self._watcher.receiver, event.devnumber, state)
-				if state == STATUS.CONNECTED:
-					n, k = dev.name, dev.kind
-					_l.debug("detected active device %s", dev)
-				else:
-					# we can query the receiver for the device short name
-					dev_id = self.request(0xFF, b'\x83\xB5', event.data[4:5])
-					if dev_id:
-						shortname = str(dev_id[2:].rstrip(b'\x00'))
-						if shortname in NAMES:
-							dev._name, dev._kind = NAMES[shortname]
-							_l.debug("detected new device %s", dev)
-						else:
-							_l.warn("could not properly detect inactive device %d: %s", event.devnumber, shortname)
-				self.detected_device = dev
+			self.detected_device = self._watcher.receiver.make_device(event)
+			return True
 
 		return True
 
diff --git a/app/receiver.py b/app/receiver.py
index 6bd2b6de..b978e6e2 100644
--- a/app/receiver.py
+++ b/app/receiver.py
@@ -6,6 +6,7 @@ from logging import getLogger as _Logger
 _LOG_LEVEL = 6
 
 from threading import Event as _Event
+from binascii import hexlify as _hexlify
 
 from logitech.unifying_receiver import base as _base
 from logitech.unifying_receiver import api as _api
@@ -26,6 +27,7 @@ class DeviceInfo(object):
 		self.number = number
 		self._name = None
 		self._kind = None
+		self._serial = None
 		self._firmware = None
 		self._features = None
 
@@ -80,6 +82,13 @@ class DeviceInfo(object):
 				self._kind = self.receiver.call_api(_api.get_device_kind, self.number, self.features)
 		return self._kind or '?'
 
+	@property
+	def serial(self):
+		if self._serial is None:
+			if self._status >= STATUS.CONNECTED:
+				pass
+		return self._serial or '?'
+
 	@property
 	def firmware(self):
 		if self._firmware is None:
@@ -219,13 +228,14 @@ class Receiver(_listener.EventsListener):
 	def serial(self):
 		if self._serial is None:
 			if self:
-				self._serial, firmware, bootloader = self.call_api(_api.get_receiver_info)
-				self._firmware = (firmware, bootloader)
+				self._serial, self._firmware = self.call_api(_api.get_receiver_info)
 		return self._serial or '?'
 
 	@property
 	def firmware(self):
-		s = self.serial
+		if self._firmware is None:
+			if self:
+				self._serial, self._firmware = self.call_api(_api.get_receiver_info)
 		return self._firmware or ('?', '?')
 
 
@@ -239,38 +249,25 @@ class Receiver(_listener.EventsListener):
 			return
 
 		if event.code == 0x10 and event.data[0:2] == b'\x41\x04':
-			state_code = ord(event.data[2:3]) & 0xF0
-			state = STATUS.UNAVAILABLE if state_code == 0x60 else \
-					STATUS.CONNECTED if state_code == 0xA0 else \
-					STATUS.CONNECTED if state_code == 0x20 else \
-					None
-			if state is None:
-				self.LOG.warn("don't know how to handle status 0x%02x: %s", state_code, event)
-				return
-
 			if event.devnumber in self.devices:
-				self.devices[event.devnumber].status = state
+				state_code = ord(event.data[2:3]) & 0xF0
+				state = STATUS.UNAVAILABLE if state_code == 0x60 else \
+						STATUS.CONNECTED if state_code == 0xA0 else \
+						STATUS.CONNECTED if state_code == 0x20 else \
+						None
+				if state is None:
+					self.LOG.warn("don't know how to handle status 0x%02x: %s", state_code, event)
+				else:
+					self.devices[event.devnumber].status = state
 				return
 
-			if event.devnumber < 1 or event.devnumber > self.max_devices:
-				self.LOG.warn("got event for invalid device number %d: %s", event.devnumber, event)
-				return
-
-			dev = DeviceInfo(self, event.devnumber, state)
-			if state == STATUS.CONNECTED:
-				n, k = dev.name, dev.kind
+			dev = self.make_device(event)
+			if dev is None:
+				self.LOG.warn("failed to make new device from %s", event)
 			else:
-				# we can query the receiver for the device short name
-				dev_id = self.request(0xFF, b'\x83\xB5', event.data[4:5])
-				if dev_id:
-					shortname = str(dev_id[2:].rstrip(b'\x00'))
-					if shortname in NAMES:
-						dev._name, dev._kind = NAMES[shortname]
-					else:
-						self.LOG.warn("could not properly detect inactive device %d: %s", event.devnumber, shortname)
-			self.devices[event.devnumber] = dev
-			self.LOG.info("new device ready %s", dev)
-			self.status = STATUS.CONNECTED + len(self.devices)
+				self.devices[event.devnumber] = dev
+				self.LOG.info("new device ready %s", dev)
+				self.status = STATUS.CONNECTED + len(self.devices)
 			return
 
 		if event.devnumber == 0xFF:
@@ -290,6 +287,40 @@ class Receiver(_listener.EventsListener):
 
 		self.LOG.warn("don't know how to handle event %s", event)
 
+	def make_device(self, event):
+		if event.devnumber < 1 or event.devnumber > self.max_devices:
+			self.LOG.warn("got event for invalid device number %d: %s", event.devnumber, event)
+			return None
+
+		state_code = ord(event.data[2:3]) & 0xF0
+		state = STATUS.UNAVAILABLE if state_code == 0x60 else \
+				STATUS.CONNECTED if state_code == 0xA0 else \
+				STATUS.CONNECTED if state_code == 0x20 else \
+				None
+		if state is None:
+			self.LOG.warn("don't know how to handle device status 0x%02x: %s", state_code, event)
+			return None
+
+		dev = DeviceInfo(self, event.devnumber, state)
+		if state == STATUS.CONNECTED:
+			n, k = dev.name, dev.kind
+		else:
+			# we can query the receiver for the device short name
+			dev_id = self.request(0xFF, b'\x83\xB5', event.data[4:5])
+			if dev_id:
+				shortname = dev_id[2:].rstrip(b'\x00').decode('ascii')
+				if shortname in NAMES:
+					dev._name, dev._kind = NAMES[shortname]
+				else:
+					self.LOG.warn("could not identify inactive device %d: %s", event.devnumber, shortname)
+
+		b = bytearray(event.data[4:5])
+		b[0] -= 0x10
+		serial = self.request(0xFF, b'\x83\xB5', bytes(b))
+		if serial:
+			dev._serial = _hexlify(serial[1:5]).decode('ascii').upper()
+		return dev
+
 	def __str__(self):
 		return 'Receiver(%s,%x,%d:%d)' % (self.path, self._handle, self._active, self._status)
 
diff --git a/app/ui/action.py b/app/ui/action.py
index 11ff8bf4..35f681b3 100644
--- a/app/ui/action.py
+++ b/app/ui/action.py
@@ -56,3 +56,4 @@ def _pair_device(action, window, state):
 	# pair_dialog.set_modal(True)
 	pair_dialog.present()
 pair = _action('add', 'Pair new device', None)
+pair.set_sensitive(False)
diff --git a/app/ui/main_window.py b/app/ui/main_window.py
index 797e2428..49d806b0 100644
--- a/app/ui/main_window.py
+++ b/app/ui/main_window.py
@@ -10,24 +10,198 @@ from logitech.devices.constants import (STATUS, PROPS)
 
 _SMALL_DEVICE_ICON_SIZE = Gtk.IconSize.BUTTON
 _DEVICE_ICON_SIZE = Gtk.IconSize.DIALOG
-_STATUS_ICON_SIZE = Gtk.IconSize.DND
+_STATUS_ICON_SIZE = Gtk.IconSize.LARGE_TOOLBAR
 _PLACEHOLDER = '~'
 
+#
+#
+#
+
+def _show_info(action, widget):
+	widget.set_visible(action.get_active())
+
+def _receiver_box(name):
+	icon = Gtk.Image.new_from_icon_name(name, _SMALL_DEVICE_ICON_SIZE)
+
+	label = Gtk.Label('Initializing...')
+	label.set_name('status-label')
+	label.set_alignment(0, 0.5)
+
+	toolbar = Gtk.Toolbar()
+	toolbar.set_name('buttons')
+	toolbar.set_style(Gtk.ToolbarStyle.ICONS)
+	toolbar.set_icon_size(Gtk.IconSize.MENU)
+	toolbar.set_show_arrow(False)
+
+	hbox = Gtk.HBox(homogeneous=False, spacing=8)
+	hbox.pack_start(icon, False, False, 0)
+	hbox.pack_start(label, True, True, 0)
+	hbox.pack_end(toolbar, False, False, 0)
+
+	info_label = Gtk.Label()
+	info_label.set_name('info-label')
+	info_label.set_alignment(0, 0.5)
+	info_label.set_padding(32, 2)
+	info_label.set_selectable(True)
+
+	info_action = ui.action._toggle_action('info', 'Receiver info', _show_info, info_label)
+	toolbar.insert(info_action.create_tool_item(), 0)
+	toolbar.insert(ui.action.pair.create_tool_item(), -1)
+
+	vbox = Gtk.VBox(homogeneous=False, spacing=4)
+	vbox.set_border_width(4)
+	vbox.pack_start(hbox, True, True, 0)
+	vbox.pack_start(info_label, True, True, 0)
+
+	frame = Gtk.Frame()
+	frame.add(vbox)
+	frame.show_all()
+	info_label.set_visible(False)
+	return frame
+
+
+def _device_box():
+	icon = Gtk.Image.new_from_icon_name('image-missing', _DEVICE_ICON_SIZE)
+	icon.set_name('icon')
+	icon.set_alignment(0.5, 0)
+
+	label = Gtk.Label('Initializing...')
+	label.set_name('label')
+	label.set_alignment(0, 0.5)
+	label.set_padding(0, 2)
+
+	battery_icon = Gtk.Image.new_from_icon_name('battery_unknown', _STATUS_ICON_SIZE)
+
+	battery_label = Gtk.Label()
+	battery_label.set_width_chars(6)
+	battery_label.set_alignment(0, 0.5)
+
+	light_icon = Gtk.Image.new_from_icon_name('light_unknown', _STATUS_ICON_SIZE)
+
+	light_label = Gtk.Label()
+	light_label.set_alignment(0, 0.5)
+	light_label.set_width_chars(8)
+
+	toolbar = Gtk.Toolbar()
+	toolbar.set_name('buttons')
+	toolbar.set_style(Gtk.ToolbarStyle.ICONS)
+	toolbar.set_icon_size(Gtk.IconSize.MENU)
+	toolbar.set_show_arrow(False)
+
+	status_box = Gtk.HBox(homogeneous=False, spacing=0)
+	status_box.set_name('status')
+	status_box.pack_start(battery_icon, False, True, 0)
+	status_box.pack_start(battery_label, False, True, 0)
+	status_box.pack_start(light_icon, False, True, 0)
+	status_box.pack_start(light_label, False, True, 0)
+	status_box.pack_end(toolbar, False, False, 0)
+
+	info_label = Gtk.Label()
+	info_label.set_name('info-label')
+	info_label.set_alignment(0, 0.5)
+	info_label.set_padding(6, 2)
+	info_label.set_selectable(True)
+
+	info_action = ui.action._toggle_action('info', 'Device info', _show_info, info_label)
+	toolbar.insert(info_action.create_tool_item(), 0)
+
+	unpair_action = ui.action._action('remove', 'Unpair', None)
+	toolbar.insert(unpair_action.create_tool_item(), -1)
+
+	vbox = Gtk.VBox(homogeneous=False, spacing=8)
+	vbox.pack_start(label, True, True, 0)
+	vbox.pack_start(status_box, True, True, 0)
+	vbox.pack_start(info_label, True, True, 0)
+
+	box = Gtk.HBox(homogeneous=False, spacing=10)
+	box.set_border_width(4)
+	box.pack_start(icon, False, False, 0)
+	box.pack_start(vbox, True, True, 0)
+	box.show_all()
+
+	frame = Gtk.Frame()
+	frame.add(box)
+	info_label.set_visible(False)
+	return frame
+
+
+def toggle(window, trigger):
+	# print 'window toggle', window, trigger
+	if window.get_visible():
+		position = window.get_position()
+		window.hide()
+		window.move(*position)
+	else:
+		if trigger and type(trigger) == Gtk.StatusIcon:
+			x, y = window.get_position()
+			if x == 0 and y == 0:
+				x, y, _ = Gtk.StatusIcon.position_menu(Gtk.Menu(), trigger)
+				window.move(x, y)
+		window.present()
+	return True
+
+
+def create(title, name, max_devices, systray=False):
+	window = Gtk.Window()
+	window.set_title(title)
+	window.set_icon_name(ui.appicon(0))
+	window.set_role('status-window')
+
+	vbox = Gtk.VBox(homogeneous=False, spacing=4)
+	vbox.set_border_width(4)
+
+	rbox = _receiver_box(name)
+	vbox.add(rbox)
+	for i in range(1, 1 + max_devices):
+		dbox = _device_box()
+		vbox.add(dbox)
+	vbox.set_visible(True)
+
+	window.add(vbox)
+
+	geometry = Gdk.Geometry()
+	geometry.min_width = 360
+	geometry.min_height = 20
+	window.set_geometry_hints(vbox, geometry, Gdk.WindowHints.MIN_SIZE)
+	window.set_resizable(False)
+
+	window.toggle_visible = lambda i: toggle(window, i)
+
+	if systray:
+		window.set_keep_above(True)
+		window.connect('delete-event', toggle)
+	else:
+		window.connect('delete-event', Gtk.main_quit)
+
+	return window
+
+#
+#
+#
+
+def _info_text(dev):
+	fw_text = '\n'.join(['%-12s\t<tt>%s%s%s</tt>' %
+						(f.kind, f.name, ' ' if f.name else '', f.version) for f in dev.firmware])
+	return ('<small>'
+			'Serial    \t\t<tt>%s</tt>\n'
+			'%s'
+			'</small>' % (dev.serial, fw_text))
+
+
+def _update_receiver_box(frame, receiver):
+	label, toolbar, info_label = ui.find_children(frame, 'status-label', 'buttons', 'info-label')
 
-def _update_receiver_box(box, receiver):
-	button, label, frame, info = ui.find_children(box,
-					'info-button', 'status-label', 'info-frame', 'info-label')
 	label.set_text(receiver.status_text or '')
 	if receiver.status < STATUS.CONNECTED:
-		button.set_sensitive(False)
-		button.set_active(False)
-		frame.set_visible(False)
-		info.set_text('')
+		toolbar.set_sensitive(False)
+		info_label.set_visible(False)
+		info_label.set_text('')
 	else:
-		button.set_sensitive(True)
-		if not info.get_text():
-			info.set_text('Serial:\t\t%s\nFirmware:   \t%s\nBootloader: \t%s\nMax devices:\t%s' %
-							(receiver.serial, receiver.firmware[0], receiver.firmware[1], receiver.max_devices))
+		toolbar.set_sensitive(True)
+		if not info_label.get_text():
+			info_label.set_markup(_info_text(receiver))
+		info_label.set_visible(toolbar.get_children()[0].get_active())
+
 
 def _update_device_box(frame, dev):
 	if dev is None:
@@ -35,27 +209,29 @@ def _update_device_box(frame, dev):
 		frame.set_name(_PLACEHOLDER)
 		return
 
-	icon, label = ui.find_children(frame, 'icon', 'label')
+	icon, label, toolbar, info_label = ui.find_children(frame, 'icon', 'label', 'buttons', 'info-label')
 
 	frame.set_visible(True)
 	if frame.get_name() != dev.name:
 		frame.set_name(dev.name)
+		icon.set_tooltip_text('')
 		icon.set_from_icon_name(ui.get_icon(dev.name, dev.kind), _DEVICE_ICON_SIZE)
-		icon.set_tooltip_text(dev.name)
 		label.set_markup('<b>' + dev.name + '</b>')
 
 	status = ui.find_children(frame, 'status')
 	if dev.status < STATUS.CONNECTED:
-		icon.set_sensitive(False)
-		icon.set_tooltip_text(dev.status_text)
 		label.set_sensitive(False)
-		status.set_visible(False)
+		status.set_sensitive(False)
+		info_label.set_visible(False)
 		return
 
-	icon.set_sensitive(True)
-	icon.set_tooltip_text('')
 	label.set_sensitive(True)
-	status.set_visible(True)
+	status.set_sensitive(True)
+	info_label.set_visible(toolbar.get_children()[0].get_active())
+
+	if not info_label.get_text():
+		info_label.set_markup(_info_text(dev))
+
 	status_icons = status.get_children()
 
 	battery_icon, battery_label = status_icons[0:2]
@@ -103,158 +279,3 @@ def update(window, receiver):
 		for index in range(1, len(controls)):
 			dev = receiver.devices[index] if index in receiver.devices else None
 			_update_device_box(controls[index], dev)
-
-#
-#
-#
-
-def _receiver_box(name):
-	info_button = Gtk.ToggleButton()
-	info_button.set_name('info-button')
-	info_button.set_alignment(0.5, 0)
-	info_button.set_image(Gtk.Image.new_from_icon_name(name, _SMALL_DEVICE_ICON_SIZE))
-	info_button.set_relief(Gtk.ReliefStyle.NONE)
-	info_button.set_tooltip_text(name)
-	info_button.set_sensitive(False)
-
-	label = Gtk.Label('Initializing...')
-	label.set_name('status-label')
-	label.set_alignment(0, 0.5)
-
-	toolbar = Gtk.Toolbar()
-	toolbar.set_name('buttons')
-	toolbar.set_style(Gtk.ToolbarStyle.ICONS)
-	toolbar.set_icon_size(Gtk.IconSize.MENU)
-	toolbar.set_show_arrow(False)
-	toolbar.insert(ui.action.pair.create_tool_item(), 0)
-
-	info_label = Gtk.Label('')
-	info_label.set_name('info-label')
-	info_label.set_alignment(0, 0.5)
-	info_label.set_padding(24, 4)
-	info_label.set_selectable(True)
-
-	info_frame = Gtk.Frame()
-	info_frame.set_name('info-frame')
-	info_frame.set_label(name)
-	info_frame.add(info_label)
-
-	info_button.connect('toggled', lambda b: info_frame.set_visible(b.get_active()))
-
-	hbox = Gtk.HBox(homogeneous=False, spacing=8)
-	hbox.pack_start(info_button, False, False, 0)
-	hbox.pack_start(label, True, True, 0)
-	hbox.pack_end(toolbar, False, False, 0)
-
-	vbox = Gtk.VBox(homogeneous=False, spacing=4)
-	vbox.set_border_width(4)
-	vbox.pack_start(hbox, True, True, 0)
-	vbox.pack_start(info_frame, True, True, 0)
-	vbox.show_all()
-
-	info_frame.set_visible(False)
-	return vbox
-
-
-def _device_box(has_status_icons=True, has_frame=True):
-	box = Gtk.HBox(homogeneous=False, spacing=10)
-	box.set_border_width(4)
-
-	icon = Gtk.Image()
-	icon.set_name('icon')
-	icon.set_from_icon_name('image-missing', _DEVICE_ICON_SIZE)
-	icon.set_alignment(0.5, 0)
-	box.pack_start(icon, False, False, 0)
-
-	vbox = Gtk.VBox(homogeneous=False, spacing=8)
-	box.pack_start(vbox, True, True, 0)
-
-	label = Gtk.Label('Initializing...')
-	label.set_name('label')
-	label.set_alignment(0, 0.5)
-
-	status_box = Gtk.HBox(homogeneous=False, spacing=0)
-	status_box.set_name('status')
-
-	if has_status_icons:
-		vbox.pack_start(label, True, True, 0)
-
-		battery_icon = Gtk.Image.new_from_icon_name('battery_unknown', _STATUS_ICON_SIZE)
-		status_box.pack_start(battery_icon, False, True, 0)
-
-		battery_label = Gtk.Label()
-		battery_label.set_width_chars(6)
-		battery_label.set_alignment(0, 0.5)
-		status_box.pack_start(battery_label, False, True, 0)
-
-		light_icon = Gtk.Image.new_from_icon_name('light_unknown', _STATUS_ICON_SIZE)
-		status_box.pack_start(light_icon, False, True, 0)
-
-		light_label = Gtk.Label()
-		light_label.set_alignment(0, 0.5)
-		light_label.set_width_chars(8)
-		status_box.pack_start(light_label, False, True, 0)
-	else:
-		status_box.pack_start(label, True, True, 0)
-
-	vbox.pack_start(status_box, True, True, 0)
-
-	box.show_all()
-
-	if has_frame:
-		frame = Gtk.Frame()
-		frame.add(box)
-		return frame
-	else:
-		return box
-
-
-def toggle(window, trigger):
-	# print 'window toggle', window, trigger
-	if window.get_visible():
-		position = window.get_position()
-		window.hide()
-		window.move(*position)
-	else:
-		if trigger and type(trigger) == Gtk.StatusIcon:
-			x, y = window.get_position()
-			if x == 0 and y == 0:
-				x, y, _ = Gtk.StatusIcon.position_menu(Gtk.Menu(), trigger)
-				window.move(x, y)
-		window.present()
-	return True
-
-
-def create(title, name, max_devices, systray=False):
-	window = Gtk.Window()
-	window.set_title(title)
-	window.set_icon_name(ui.appicon(0))
-	window.set_role('status-window')
-
-	vbox = Gtk.VBox(homogeneous=False, spacing=4)
-	vbox.set_border_width(4)
-
-	rbox = _receiver_box(name)
-	vbox.add(rbox)
-	for i in range(1, 1 + max_devices):
-		dbox = _device_box()
-		vbox.add(dbox)
-	vbox.set_visible(True)
-
-	window.add(vbox)
-
-	geometry = Gdk.Geometry()
-	geometry.min_width = 300
-	geometry.min_height = 40
-	window.set_geometry_hints(vbox, geometry, Gdk.WindowHints.MIN_SIZE)
-	window.set_resizable(False)
-
-	window.toggle_visible = lambda i: toggle(window, i)
-
-	if systray:
-		window.set_keep_above(True)
-		window.connect('delete-event', toggle)
-	else:
-		window.connect('delete-event', Gtk.main_quit)
-
-	return window
diff --git a/app/watcher.py b/app/watcher.py
index 4f718ee6..0609a0be 100644
--- a/app/watcher.py
+++ b/app/watcher.py
@@ -5,16 +5,21 @@
 from threading import Thread
 import time
 from logging import getLogger as _Logger
-from collections import namedtuple
 
 from logitech.devices.constants import STATUS
 from receiver import Receiver
 
 
-_DUMMY_RECEIVER = namedtuple('_DUMMY_RECEIVER', ['NAME', 'kind', 'status', 'status_text', 'max_devices', 'devices'])
-_DUMMY_RECEIVER.__nonzero__ = lambda _: False
-_DUMMY_RECEIVER.device_name = Receiver.NAME
-DUMMY = _DUMMY_RECEIVER(Receiver.NAME, Receiver.NAME, STATUS.UNAVAILABLE, 'Receiver not found.', Receiver.max_devices, {})
+class _DUMMY_RECEIVER:
+	NAME = Receiver.NAME
+	device_name = NAME
+	kind = Receiver.NAME
+	status = STATUS.UNAVAILABLE
+	status_text = 'Receiver not found.'
+	max_devices = Receiver.max_devices
+	devices = {}
+	def __nonzero__(self): return False
+DUMMY = _DUMMY_RECEIVER()
 
 _l = _Logger('watcher')
 
diff --git a/lib/logitech/devices/constants.py b/lib/logitech/devices/constants.py
index 3fb3bcfd..32da3911 100644
--- a/lib/logitech/devices/constants.py
+++ b/lib/logitech/devices/constants.py
@@ -34,9 +34,11 @@ NAMES = {
 			'M325': ('Wireless Mouse M325', 'mouse'),
 			'M510': ('Wireless Mouse M510', 'mouse'),
 			'M515': ('Couch Mouse M515', 'mouse'),
+			'M525': ('Wireless Mouse M525', 'mouse'),
 			'M570': ('Wireless Trackball M570', 'trackball'),
 			'K270': ('Wireless Keyboard K270', 'keyboard'),
 			'K350': ('Wireless Keyboard K350', 'keyboard'),
 			'K750': ('Wireless Solar Keyboard K750', 'keyboard'),
 			'K800': ('Wireless Illuminated Keyboard K800', 'keyboard'),
+			'T650': ('Wireless Rechargeable Touchpad T650', 'touchpad'),
 		}
diff --git a/lib/logitech/unifying_receiver/api.py b/lib/logitech/unifying_receiver/api.py
index 4bc38611..27a76cc4 100644
--- a/lib/logitech/unifying_receiver/api.py
+++ b/lib/logitech/unifying_receiver/api.py
@@ -42,23 +42,21 @@ def get_receiver_info(handle):
 	if reply and reply[0:1] == b'\x03':
 		serial = _hexlify(reply[1:5]).decode('ascii').upper()
 
-	firmware = '??.??'
-	reply = _base.request(handle, 0xFF, b'\x81\xF1', b'\x01')
-	if reply and reply[0:1] == b'\x01':
-		fw_version = _hexlify(reply[1:3]).decode('ascii')
-		firmware = '%s.%s' % (fw_version[0:2], fw_version[2:4])
+	firmware = []
 
-	reply = _base.request(handle, 0xFF, b'\x81\xF1', b'\x02')
+	reply = _base.request(handle, 0xFF, b'\x83\xB5', b'\x02')
 	if reply and reply[0:1] == b'\x02':
-		firmware += '.' + _hexlify(reply[1:3]).decode('ascii')
+		fw_version = _hexlify(reply[1:5]).decode('ascii')
+		fw_version = '%s.%s.%s' % (fw_version[0:2], fw_version[2:4], fw_version[4:8])
+		firmware.append(_FirmwareInfo(0, FIRMWARE_KIND[0], '', fw_version, None))
 
-	bootloader = None
 	reply = _base.request(handle, 0xFF, b'\x81\xF1', b'\x04')
 	if reply and reply[0:1] == b'\x04':
 		bl_version = _hexlify(reply[1:3]).decode('ascii')
-		bootloader = '%s.%s' % (bl_version[0:2], bl_version[2:4])
+		bl_version = '%s.%s' % (bl_version[0:2], bl_version[2:4])
+		firmware.append(_FirmwareInfo(1, FIRMWARE_KIND[1], '', bl_version, None))
 
-	return (serial, firmware, bootloader)
+	return (serial, tuple(firmware))
 
 
 def count_devices(handle):
@@ -270,8 +268,8 @@ def get_device_firmware(handle, devnumber, features=None):
 
 	:returns: a list of FirmwareInfo tuples, ordered by firmware layer.
 	"""
-	def _makeFirmwareInfo(level, kind, name=None, version=None, build=None, extras=None):
-		return _FirmwareInfo(level, kind, name, version, build, extras)
+	def _makeFirmwareInfo(level, kind, name='', version='', extras=None):
+		return _FirmwareInfo(level, kind, name, version, extras)
 
 	fw_count = request(handle, devnumber, FEATURE.FIRMWARE, features=features)
 	if fw_count:
@@ -286,14 +284,16 @@ def get_device_firmware(handle, devnumber, features=None):
 					kind = FIRMWARE_KIND[level]
 					name, = _unpack('!3s', fw_info[1:4])
 					name = name.decode('ascii')
-					version = _hexlify(fw_info[4:6])
+					version = _hexlify(fw_info[4:6]).decode('ascii')
 					version = '%s.%s' % (version[0:2], version[2:4])
 					build, = _unpack('!H', fw_info[6:8])
+					if build:
+						version += ' b%d' % build
 					extras = fw_info[9:].rstrip(b'\x00')
 					if extras:
-						fw_info = _makeFirmwareInfo(level, kind, name, version, build, extras)
+						fw_info = _makeFirmwareInfo(level, kind, name, version, extras)
 					else:
-						fw_info = _makeFirmwareInfo(level, kind, name, version, build)
+						fw_info = _makeFirmwareInfo(level, kind, name, version)
 				elif level == 2:
 					fw_info = _makeFirmwareInfo(2, FIRMWARE_KIND[2], version=ord(fw_info[1:2]))
 				else:
diff --git a/lib/logitech/unifying_receiver/base.py b/lib/logitech/unifying_receiver/base.py
index 799ca06a..eb871307 100644
--- a/lib/logitech/unifying_receiver/base.py
+++ b/lib/logitech/unifying_receiver/base.py
@@ -105,7 +105,7 @@ def try_open(path):
 	# otherwise, the read should produce nothing
 	reply = _hid.read(receiver_handle, _MAX_REPLY_SIZE, DEFAULT_TIMEOUT)
 	if reply:
-		if reply[:4] == b'\x10\x00\x8F\x00':
+		if reply[:5] == b'\x10\x00\x8F\x00\x10':
 			# 'device 0 unreachable' is the expected reply from a valid receiver handle
 			_l.log(_LOG_LEVEL, "[%s] success: handle %x", path, receiver_handle)
 			return receiver_handle
@@ -114,9 +114,9 @@ def try_open(path):
 		if _l.isEnabledFor(_LOG_LEVEL):
 			if reply == b'\x01\x00\x00\x00\x00\x00\x00\x00':
 				# no idea what this is, but it comes up occasionally
-				_l.log(_LOG_LEVEL, "[%s] %x mistery reply [%s]", path, receiver_handle, _hexlify(reply))
+				_l.log(_LOG_LEVEL, "[%s] %x mistery reply [%s]", path, receiver_handle, _hexlify(reply).decode('ascii'))
 			else:
-				_l.log(_LOG_LEVEL, "[%s] %x unknown reply [%s]", path, receiver_handle, _hexlify(reply))
+				_l.log(_LOG_LEVEL, "[%s] %x unknown reply [%s]", path, receiver_handle, _hexlify(reply).decode('ascii'))
 	else:
 		_l.log(_LOG_LEVEL, "[%s] %x no reply", path, receiver_handle)
 
@@ -171,7 +171,7 @@ def write(handle, devnumber, data):
 	wdata = _pack('!BB18s' if len(data) > 5 else '!BB5s', 0x10, devnumber, data)
 
 	if _l.isEnabledFor(_LOG_LEVEL):
-		hexs = _hexlify(wdata)
+		hexs = _hexlify(wdata).decode('ascii')
 		_l.log(_LOG_LEVEL, "(%d) <= w[%s %s %s %s]", devnumber, hexs[0:2], hexs[2:4], hexs[4:8], hexs[8:])
 
 	if not _hid.write(handle, wdata):
@@ -208,7 +208,7 @@ def read(handle, timeout=DEFAULT_TIMEOUT):
 		if len(data) > _MAX_REPLY_SIZE:
 			_l.warn("(%d) => r[%s] read packet too long: %d bytes", ord(data[1:2]), _hexlify(data), len(data))
 		if _l.isEnabledFor(_LOG_LEVEL):
-			hexs = _hexlify(data)
+			hexs = _hexlify(data).decode('ascii')
 			_l.log(_LOG_LEVEL, "(%d) => r[%s %s %s %s]", ord(data[1:2]), hexs[0:2], hexs[2:4], hexs[4:8], hexs[8:])
 		code = ord(data[:1])
 		devnumber = ord(data[1:2])
@@ -235,7 +235,9 @@ def request(handle, devnumber, feature_index_function, params=b'', features=None
 	:raisees FeatureCallError: if the feature call replied with an error.
 	"""
 	if _l.isEnabledFor(_LOG_LEVEL):
-		_l.log(_LOG_LEVEL, "(%d) request {%s} params [%s]", devnumber, _hexlify(feature_index_function), _hexlify(params))
+		_l.log(_LOG_LEVEL, "(%d) request {%s} params [%s]", devnumber,
+				_hexlify(feature_index_function).decode('ascii'),
+				_hexlify(params).decode('ascii'))
 	if len(feature_index_function) != 2:
 		raise ValueError('invalid feature_index_function {%s}: it must be a two-byte string' % _hexlify(feature_index_function))
 
@@ -264,18 +266,20 @@ def request(handle, devnumber, feature_index_function, params=b'', features=None
 
 		if reply_code == 0x10 and reply_data[:1] == b'\x8F' and reply_data[1:3] == feature_index_function:
 			# device not present
-			_l.log(_LOG_LEVEL, "(%d) request ping failed on {%s} call: [%s]", devnumber, _hexlify(feature_index_function), _hexlify(reply_data))
+			_l.log(_LOG_LEVEL, "(%d) request ping failed on {%s} call: [%s]", devnumber,
+					_hexlify(feature_index_function).decode('ascii'),
+					_hexlify(reply_data).decode('ascii'))
 			return None
 
 		if reply_code == 0x10 and reply_data[:1] == b'\x8F':
 			# device not present
-			_l.log(_LOG_LEVEL, "(%d) request ping failed: [%s]", devnumber, _hexlify(reply_data))
+			_l.log(_LOG_LEVEL, "(%d) request ping failed: [%s]", devnumber, _hexlify(reply_data).decode('ascii'))
 			return None
 
 		if reply_code == 0x11 and reply_data[0] == b'\xFF' and reply_data[1:3] == feature_index_function:
 			# the feature call returned with an error
 			error_code = ord(reply_data[3])
-			_l.warn("(%d) request feature call error %d = %s: %s", devnumber, error_code, ERROR_NAME[error_code], _hexlify(reply_data))
+			_l.warn("(%d) request feature call error %d = %s: %s", devnumber, error_code, ERROR_NAME[error_code], _hexlify(reply_data).decode('ascii'))
 			feature_index = ord(feature_index_function[:1])
 			feature_function = feature_index_function[1:2]
 			feature = None if features is None else features[feature_index] if feature_index < len(features) else None
@@ -283,14 +287,16 @@ def request(handle, devnumber, feature_index_function, params=b'', features=None
 
 		if reply_code == 0x11 and reply_data[:2] == feature_index_function:
 			# a matching reply
-			# _l.log(_LOG_LEVEL, "(%d) matched reply with feature-index-function [%s]", devnumber, _hexlify(reply_data[2:]))
+			# _l.log(_LOG_LEVEL, "(%d) matched reply with feature-index-function [%s]", devnumber, _hexlify(reply_data[2:]).decode('ascii'))
 			return reply_data[2:]
 
 		if reply_code == 0x10 and devnumber == 0xFF and reply_data[:2] == feature_index_function:
 			# direct calls to the receiver (device 0xFF) may also return successfully with reply code 0x10
-			# _l.log(_LOG_LEVEL, "(%d) matched reply with feature-index-function [%s]", devnumber, _hexlify(reply_data[2:]))
+			# _l.log(_LOG_LEVEL, "(%d) matched reply with feature-index-function [%s]", devnumber, _hexlify(reply_data[2:]).decode('ascii'))
 			return reply_data[2:]
 
-		# _l.log(_LOG_LEVEL, "(%d) unmatched reply {%s} (expected {%s})", devnumber, _hexlify(reply_data[:2]), _hexlify(feature_index_function))
+		# _l.log(_LOG_LEVEL, "(%d) unmatched reply {%s} (expected {%s})", devnumber,
+		# 		_hexlify(reply_data[:2]).decode('ascii'),
+		# 		_hexlify(feature_index_function).decode('ascii'))
 		if unhandled_hook:
 			unhandled_hook(reply_code, reply_devnumber, reply_data)
diff --git a/lib/logitech/unifying_receiver/common.py b/lib/logitech/unifying_receiver/common.py
index 6a181e2a..d13081ba 100644
--- a/lib/logitech/unifying_receiver/common.py
+++ b/lib/logitech/unifying_receiver/common.py
@@ -36,7 +36,6 @@ FirmwareInfo = namedtuple('FirmwareInfo', [
 				'kind',
 				'name',
 				'version',
-				'build',
 				'extras'])
 
 """Reprogrammable keys informations."""
diff --git a/lib/logitech/unifying_receiver/constants.py b/lib/logitech/unifying_receiver/constants.py
index 98669b4b..802a4fea 100644
--- a/lib/logitech/unifying_receiver/constants.py
+++ b/lib/logitech/unifying_receiver/constants.py
@@ -55,7 +55,7 @@ _DEVICE_KINDS = ('keyboard', 'remote control', 'numpad', 'mouse',
 DEVICE_KIND = FallbackDict(lambda x: 'unknown', list2dict(_DEVICE_KINDS))
 
 
-_FIRMWARE_KINDS = ('Main (HID)', 'Bootloader', 'Hardware', 'Other')
+_FIRMWARE_KINDS = ('Firmware', 'Bootloader', 'Hardware', 'Other')
 
 """Names of different firmware levels possible, indexed by level."""
 FIRMWARE_KIND = FallbackDict(lambda x: 'Unknown', list2dict(_FIRMWARE_KINDS))
diff --git a/lib/logitech/ur_scanner.py b/lib/logitech/ur_scanner.py
index a2e1d6d8..21de2a0c 100644
--- a/lib/logitech/ur_scanner.py
+++ b/lib/logitech/ur_scanner.py
@@ -13,11 +13,11 @@ from .unifying_receiver.constants import *
 def print_receiver(receiver):
 	print ("Unifying Receiver")
 
-	serial, firmware, bootloader = api.get_receiver_info(receiver)
+	serial, firmware  = api.get_receiver_info(receiver)
 
-	print ("  Serial: %s" % serial)
-	print ("  Firmware version: %s" % firmware)
-	print ("  Bootloader: %s" % bootloader)
+	print ("  Serial    : %s" % serial)
+	for f in firmware:
+		print ("  %-10s: %s" % (f.kind, f.version))
 
 	print ("--------")
 
@@ -36,7 +36,7 @@ def scan_devices(receiver):
 
 		firmware = api.get_device_firmware(receiver, devinfo.number, features=devinfo.features)
 		for fw in firmware:
-			print ("  %s firmware: %s version %s build %d" % (fw.kind, fw.name, fw.version, fw.build))
+			print ("  %-10s: %s %s" % (fw.kind, fw.name, fw.version))
 
 		for index in range(0, len(devinfo.features)):
 			feature = devinfo.features[index]
@@ -62,7 +62,7 @@ if __name__ == '__main__':
 	import argparse
 	arg_parser = argparse.ArgumentParser()
 	arg_parser.add_argument('-v', '--verbose', action='count', default=0,
-							help='increase the logger verbosity')
+							help='log the HID data traffic with the receiver')
 	args = arg_parser.parse_args()
 
 	log_level = logging.root.level - 10 * args.verbose