diff --git a/docs/devices.md b/docs/devices.md
index 435a6a33..10dfa13f 100644
--- a/docs/devices.md
+++ b/docs/devices.md
@@ -211,8 +211,8 @@ setting is useful only to disable smooth scrolling.
 | MK550            |      |       |         |                                         |
 | MK700            | 2008 | 1.0   | yes     | FN swap, reprog keys                    |
 | MK710            |      | 1.0   | yes     | FN swap, reprog keys                    |
-| EX100 keyboard   | 6500 | 1.0   | yes     |                                         |
-| EX100 mouse      | 3f00 | 1.0   | yes     |                                         |
+| EX100 keyboard   | 0065 | 1.0   | yes     |                                         |
+| EX100 mouse      | 003f | 1.0   | yes     |                                         |
 
 * The EX100 is old, preunifying set, supporting only part of HID++ 1.0 features
 
diff --git a/lib/hidapi/__init__.py b/lib/hidapi/__init__.py
index 4202b676..3f0eaded 100644
--- a/lib/hidapi/__init__.py
+++ b/lib/hidapi/__init__.py
@@ -23,6 +23,7 @@ from __future__ import absolute_import, division, print_function, unicode_litera
 from hidapi.udev import close  # noqa: F401
 from hidapi.udev import enumerate  # noqa: F401
 from hidapi.udev import find_paired_node  # noqa: F401
+from hidapi.udev import find_paired_node_wpid  # noqa: F401
 from hidapi.udev import get_manufacturer  # noqa: F401
 from hidapi.udev import get_product  # noqa: F401
 from hidapi.udev import get_serial  # noqa: F401
diff --git a/lib/hidapi/udev.py b/lib/hidapi/udev.py
index be7146bc..b5ace0fe 100644
--- a/lib/hidapi/udev.py
+++ b/lib/hidapi/udev.py
@@ -176,6 +176,27 @@ def find_paired_node(receiver_path, index, timeout):
     return None
 
 
+def find_paired_node_wpid(receiver_path, index):
+    """Find the node of a device paired with a receiver, get wpid from udev"""
+    context = _Context()
+    receiver_phys = _Devices.from_device_file(context, receiver_path).find_parent('hid').get('HID_PHYS')
+
+    if not receiver_phys:
+        return None
+
+    phys = f'{receiver_phys}:{index}'
+    for dev in context.list_devices(subsystem='hidraw'):
+        dev_phys = dev.find_parent('hid').get('HID_PHYS')
+        if dev_phys and dev_phys == phys:
+            # get hid id like 0003:0000046D:00000065
+            hid_id = dev.find_parent('hid').get('HID_ID')
+            # get wpid - last 4 symbols
+            udev_wpid = hid_id[-4:]
+            return udev_wpid
+
+    return None
+
+
 def monitor_glib(callback, *device_filters):
     from gi.repository import GLib
 
diff --git a/lib/logitech_receiver/base_usb.py b/lib/logitech_receiver/base_usb.py
index edfbe0f2..1ff3b0c6 100644
--- a/lib/logitech_receiver/base_usb.py
+++ b/lib/logitech_receiver/base_usb.py
@@ -27,7 +27,7 @@ from __future__ import absolute_import, division, print_function, unicode_litera
 ## should this last be changed so that may_unpair is used for all receivers? writing to _R.receiver_pairing doesn't seem right
 # re_pairs determines whether a receiver pairs by replacing existing pairings, default to False
 ## currently only one receiver is so marked - should there be more?
-# ex100_wpid_fix enable workarounds for EX100 and possible other old 27Mhz receivers
+# ex100_27mhz_wpid_fix enable workarounds for EX100 and possible other old 27Mhz receivers
 
 _DRIVER = ('hid-generic', 'generic-usb', 'logitech-djreceiver')
 
@@ -96,7 +96,7 @@ _ex100_receiver = lambda product_id: {
     'max_devices': 4,
     'may_unpair': False,
     're_pairs': True,
-    'ex100_wpid_fix': True
+    'ex100_27mhz_wpid_fix': True
 }
 
 _wired_device = lambda product_id: {'vendor_id': 0x046d, 'product_id': product_id, 'usb_interface': 2}
diff --git a/lib/logitech_receiver/descriptors.py b/lib/logitech_receiver/descriptors.py
index 1e5164a2..3e7fca82 100644
--- a/lib/logitech_receiver/descriptors.py
+++ b/lib/logitech_receiver/descriptors.py
@@ -169,7 +169,7 @@ _D(
 _D(
     'Wireless Keyboard MK300',
     protocol=1.0,
-    wpid='8521',
+    wpid='0068',
     registers=(_R.battery_status, ),
 )
 
@@ -292,14 +292,14 @@ _D(
     'Wireless Keyboard S510',
     codename='S510',
     protocol=1.0,
-    wpid='3622',
+    wpid='0056',
     registers=(_R.battery_status, ),
 )
 _D(
     'Wireless Keyboard EX100',
     codename='EX100',
     protocol=1.0,
-    wpid='6500',
+    wpid='0065',
     registers=(_R.battery_status, ),
 )
 
@@ -523,21 +523,21 @@ _D(
     'LX5 Cordless Mouse',
     codename='LX5',
     protocol=1.0,
-    wpid='5612',
+    wpid='0036',
     registers=(_R.battery_status, ),
 )
 _D(
     'Wireless Mouse M30',
     codename='M30',
     protocol=1.0,
-    wpid='6822',
+    wpid='0085',
     registers=(_R.battery_status, ),
 )
 _D(
     'Wireless Mouse EX100',
     codename='EX100m',
     protocol=1.0,
-    wpid='3F00',
+    wpid='003F',
     registers=(_R.battery_status, ),
     # settings=[ _RS.smooth_scroll(), ], # command accepted, but no change in whell action
 )
diff --git a/lib/logitech_receiver/device.py b/lib/logitech_receiver/device.py
index bfa12672..d00738db 100644
--- a/lib/logitech_receiver/device.py
+++ b/lib/logitech_receiver/device.py
@@ -81,9 +81,13 @@ class Device(object):
                 self.wpid = _strhex(link_notification.data[2:3] + link_notification.data[1:2])
                 # assert link_notification.address == (0x04 if unifying else 0x03)
                 kind = ord(link_notification.data[0:1]) & 0x0F
+                # get 27Mhz wpid and set kind based on index
+                if receiver.ex100_27mhz_wpid_fix:  # 27 Mhz receiver
+                    self.wpid = '00' + _strhex(link_notification.data[2:3])
+                    kind = self.get_kind_from_index(number, receiver)
                 self._kind = _hidpp10.DEVICE_KIND[kind]
             else:
-                # force a reading of the wpid
+                # Not a notification, force a reading of the wpid
                 pair_info = self.receiver.read_register(_R.receiver_info, 0x20 + number - 1)
                 if pair_info:
                     # may be either a Unifying receiver, or an Unifying-ready
@@ -91,20 +95,14 @@ class Device(object):
                     self.wpid = _strhex(pair_info[3:5])
                     kind = ord(pair_info[7:8]) & 0x0F
                     self._kind = _hidpp10.DEVICE_KIND[kind]
-                elif receiver.ex100_wpid_fix:
-                    # ex100 receiver, fill fake device_info with known wpid's
-                    # accordingly to drivers/hid/hid-logitech-dj.c
-                    # index 1 or 2 always mouse, index 3 always the keyboard,
-                    # index 4 is used for an optional separate numpad
-                    if number == 1:  # mouse
-                        self.wpid = '3F00'
-                        self._kind = _hidpp10.DEVICE_KIND[2]
-                    elif number == 3:  # keyboard
-                        self.wpid = '6500'
-                        self._kind = _hidpp10.DEVICE_KIND[1]
-                    else:  # unknown device number on EX100
-                        _log.error('failed to set fake EX100 wpid for device %d of %s', number, receiver)
-                        raise _base.NoSuchDevice(number=number, receiver=receiver, error='Unknown EX100 device')
+                elif receiver.ex100_27mhz_wpid_fix:
+                    # 27Mhz receiver, fill extracting WPID from udev path
+                    self.wpid = _hid.find_paired_node_wpid(receiver.path, number)
+                    if not self.wpid:
+                        _log.error('Unable to get wpid from udev for device %d of %s', number, receiver)
+                        raise _base.NoSuchDevice(number=number, receiver=receiver, error='Not present 27Mhz device')
+                    kind = self.get_kind_from_index(number, receiver)
+                    self._kind = _hidpp10.DEVICE_KIND[kind]
                 else:
                     # unifying protocol not supported, must be a Nano receiver
                     device_info = self.receiver.read_register(_R.receiver_info, 0x04)
@@ -289,6 +287,25 @@ class Device(object):
             self._feature_settings_checked = _check_feature_settings(self, self._settings)
         return self._settings
 
+    def get_kind_from_index(self, index, receiver):
+        """Get device kind from 27Mhz device index"""
+        # accordingly to drivers/hid/hid-logitech-dj.c
+        # index 1 or 2 always mouse, index 3 always the keyboard,
+        # index 4 is used for an optional separate numpad
+
+        if index == 1:  # mouse
+            kind = 2
+        elif index == 2:  # mouse
+            kind = 2
+        elif index == 3:  # keyboard
+            kind = 1
+        elif index == 4:  # numpad
+            kind = 3
+        else:  # unknown device number on 27Mhz receiver
+            _log.error('failed to calculate device kind for device %d of %s', index, receiver)
+            raise _base.NoSuchDevice(number=index, receiver=receiver, error='Unknown 27Mhz device number')
+        return kind
+
     def enable_notifications(self, enable=True):
         """Enable or disable device (dis)connection notifications on this
         receiver."""
diff --git a/lib/logitech_receiver/notifications.py b/lib/logitech_receiver/notifications.py
index 5baa69ea..a5dddefb 100644
--- a/lib/logitech_receiver/notifications.py
+++ b/lib/logitech_receiver/notifications.py
@@ -203,6 +203,9 @@ def _process_hidpp10_notification(device, status, n):
         )
         if protocol_name:
             wpid = _strhex(n.data[2:3] + n.data[1:2])
+            # workaround for short EX100 and other 27 MHz wpids
+            if protocol_name == '27 MHz':
+                wpid = '00' + _strhex(n.data[2:3])
             if wpid != device.wpid:
                 _log.warn('%s wpid mismatch, got %s', device, wpid)
             flags = ord(n.data[:1]) & 0xF0
diff --git a/lib/logitech_receiver/receiver.py b/lib/logitech_receiver/receiver.py
index 4db61af2..f2ccce27 100644
--- a/lib/logitech_receiver/receiver.py
+++ b/lib/logitech_receiver/receiver.py
@@ -79,7 +79,7 @@ class Receiver(object):
         self._str = '<%s(%s,%s%s)>' % (
             self.name.replace(' ', ''), self.path, '' if isinstance(self.handle, int) else 'T', self.handle
         )
-        self.ex100_wpid_fix = product_info.get('ex100_wpid_fix', False)
+        self.ex100_27mhz_wpid_fix = product_info.get('ex100_27mhz_wpid_fix', False)
 
         self._firmware = None
         self._devices = {}