diff --git a/lib/logitech/unifying_receiver/base.py b/lib/logitech/unifying_receiver/base.py
index 86a4ad64..40b68e5b 100644
--- a/lib/logitech/unifying_receiver/base.py
+++ b/lib/logitech/unifying_receiver/base.py
@@ -371,15 +371,15 @@ def ping(handle, devnumber):
 		delta = _timestamp() - now
 
 		if reply:
-			report_id, number, data = reply
-			if number == devnumber:
-				if data[:2] == request_data[:2] and data[4:5] == request_data[-1:]:
+			report_id, reply_devnumber, reply_data = reply
+			if reply_devnumber == devnumber:
+				if reply_data[:2] == request_data[:2] and reply_data[4:5] == request_data[-1:]:
 					# HID++ 2.0+ device, currently connected
-					return ord(data[2:3]) + ord(data[3:4]) / 10.0
+					return ord(reply_data[2:3]) + ord(reply_data[3:4]) / 10.0
 
-				if report_id == 0x10 and data[:1] == b'\x8F' and data[1:3] == request_data[:2]:
-					assert data[-1:] == b'\x00'
-					error = ord(data[3:4])
+				if report_id == 0x10 and reply_data[:1] == b'\x8F' and reply_data[1:3] == request_data[:2]:
+					assert reply_data[-1:] == b'\x00'
+					error = ord(reply_data[3:4])
 
 					if error == _hidpp10.ERROR.invalid_SubID__command: # a valid reply from a HID++ 1.0 device
 						return 1.0
diff --git a/lib/logitech/unifying_receiver/common.py b/lib/logitech/unifying_receiver/common.py
index a69c22aa..a506a5cf 100644
--- a/lib/logitech/unifying_receiver/common.py
+++ b/lib/logitech/unifying_receiver/common.py
@@ -17,7 +17,7 @@ class NamedInt(int):
 	def __new__(cls, value, name):
 		assert isinstance(name, str) or isinstance(name, unicode)
 		obj = int.__new__(cls, value)
-		obj.name = str(name)
+		obj.name = unicode(name)
 		return obj
 
 	def bytes(self, count=2):
@@ -66,8 +66,7 @@ class NamedInts(object):
 		def _readable_name(n):
 			if not isinstance(n, str) and not isinstance(n, unicode):
 				raise TypeError("expected string, got " + type(n))
-			n = n.replace('__', '/').replace('_', ' ')
-			return str(n)
+			return n.replace('__', '/').replace('_', ' ')
 
 		values = {k: NamedInt(v, _readable_name(k)) for (k, v) in kwargs.items()}
 		self.__dict__ = values
@@ -75,8 +74,6 @@ class NamedInts(object):
 		self._indexed = {int(v): v for v in self._values}
 		self._fallback = None
 
-		# print ('%r' % self)
-
 	@classmethod
 	def range(cls, from_value, to_value, name_generator=lambda x: str(x), step=1):
 		values = {name_generator(x): x for x in range(from_value, to_value + 1, step)}
diff --git a/lib/logitech/unifying_receiver/descriptors.py b/lib/logitech/unifying_receiver/descriptors.py
index 32dfac90..56849c3a 100644
--- a/lib/logitech/unifying_receiver/descriptors.py
+++ b/lib/logitech/unifying_receiver/descriptors.py
@@ -82,7 +82,7 @@ _D('Touch Mouse M600')
 _D('Marathon Mouse M705',
 				settings=[
 							_register_smooth_scroll(0x01, true_value=0x40, mask=0x40),
-							# _register_dpi(0x63, _NamedInts.range(9, 11, lambda x: str(x * 100))),
+							# _register_dpi(0x63, _NamedInts(**{'100': 10, '300': 30, '350':35, '500':50})),
 						],
 				)
 _D('Wireless Keyboard K230')
diff --git a/lib/logitech/unifying_receiver/hidpp10.py b/lib/logitech/unifying_receiver/hidpp10.py
index 7295e7e9..95da0f37 100644
--- a/lib/logitech/unifying_receiver/hidpp10.py
+++ b/lib/logitech/unifying_receiver/hidpp10.py
@@ -41,7 +41,7 @@ POWER_SWITCH_LOCATION = _NamedInts(
 NOTIFICATION_FLAG = _NamedInts(
 				battery_status=0x100000,
 				wireless=0x000100,
-				software_present=0x0000800)
+				software_present=0x000800)
 
 ERROR = _NamedInts(
 				invalid_SubID__command=0x01,
diff --git a/lib/solaar/listener.py b/lib/solaar/listener.py
index e93f381c..36f25213 100644
--- a/lib/solaar/listener.py
+++ b/lib/solaar/listener.py
@@ -25,7 +25,7 @@ del namedtuple
 def _ghost(device):
 	return _GHOST_DEVICE(number=device.number, name=device.name, kind=device.kind, status=None, max_devices=None)
 
-DUMMY = _GHOST_DEVICE(Receiver.number, Receiver.name, None, 'Receiver not found.', Receiver.max_devices)
+DUMMY = _GHOST_DEVICE(Receiver.number, 'dialog-error', None, 'Receiver not found.', 6)
 
 #
 #