diff --git a/lib/logitech_receiver/common.py b/lib/logitech_receiver/common.py
index 6fce9c603f..6471570210 100644
--- a/lib/logitech_receiver/common.py
+++ b/lib/logitech_receiver/common.py
@@ -619,3 +619,13 @@ class Alert(IntEnum):
     SHOW_WINDOW = 0x02
     ATTENTION = 0x04
     ALL = 0xFF
+
+
+class Notification(IntEnum):
+    NO_OPERATION = 0x00
+    CONNECT_DISCONNECT = 0x40
+    DJ_PAIRING = 0x41
+    CONNECTED = 0x42
+    RAW_INPUT = 0x49
+    PAIRING_LOCK = 0x4A
+    POWER = 0x4B
diff --git a/lib/logitech_receiver/notifications.py b/lib/logitech_receiver/notifications.py
index 0f8c68bada..5d4afa9ed1 100644
--- a/lib/logitech_receiver/notifications.py
+++ b/lib/logitech_receiver/notifications.py
@@ -33,6 +33,7 @@
 from . import settings_templates
 from .common import Alert
 from .common import BatteryStatus
+from .common import Notification
 
 logger = logging.getLogger(__name__)
 
@@ -58,7 +59,7 @@ def _process_receiver_notification(receiver, n):
     # supposedly only 0x4x notifications arrive for the receiver
     assert n.sub_id & 0x40 == 0x40
 
-    if n.sub_id == 0x4A:  # pairing lock notification
+    if n.sub_id == Notification.PAIRING_LOCK:
         receiver.pairing.lock_open = bool(n.address & 0x01)
         reason = _("pairing lock is open") if receiver.pairing.lock_open else _("pairing lock is closed")
         if logger.isEnabledFor(logging.INFO):
@@ -147,7 +148,8 @@ def _process_device_notification(device, n):
     # incoming packets with SubId >= 0x80 are supposedly replies from HID++ 1.0 requests, should never get here
     assert n.sub_id & 0x80 == 0
 
-    if n.sub_id == 00:  # no-op feature notification, dispose of it quickly
+    if n.sub_id == Notification.NO_OPERATION:
+        # dispose it
         return False
 
     # Allow the device object to handle the notification using custom per-device state.
@@ -188,19 +190,19 @@ def _process_dj_notification(device, n):
     if logger.isEnabledFor(logging.DEBUG):
         logger.debug("%s (%s) DJ %s", device, device.protocol, n)
 
-    if n.sub_id == 0x40:
+    if n.sub_id == Notification.CONNECT_DISCONNECT:
         # do all DJ paired notifications also show up as HID++ 1.0 notifications?
         if logger.isEnabledFor(logging.INFO):
             logger.info("%s: ignoring DJ unpaired: %s", device, n)
         return True
 
-    if n.sub_id == 0x41:
+    if n.sub_id == Notification.DJ_PAIRING:
         # do all DJ paired notifications also show up as HID++ 1.0 notifications?
         if logger.isEnabledFor(logging.INFO):
             logger.info("%s: ignoring DJ paired: %s", device, n)
         return True
 
-    if n.sub_id == 0x42:
+    if n.sub_id == Notification.CONNECTED:
         connected = not n.address & 0x01
         if logger.isEnabledFor(logging.INFO):
             logger.info("%s: DJ connection: %s %s", device, connected, n)
@@ -224,7 +226,7 @@ def _process_hidpp10_custom_notification(device, n):
 
 
 def _process_hidpp10_notification(device, n):
-    if n.sub_id == 0x40:  # device unpairing
+    if n.sub_id == Notification.CONNECT_DISCONNECT:  # device unpairing
         if n.address == 0x02:
             # device un-paired
             device.wpid = None
@@ -236,7 +238,7 @@ def _process_hidpp10_notification(device, n):
             logger.warning("%s: disconnection with unknown type %02X: %s", device, n.address, n)
         return True
 
-    if n.sub_id == 0x41:  # device connection (and disconnection)
+    if n.sub_id == Notification.DJ_PAIRING:  # device connection (and disconnection)
         flags = ord(n.data[:1]) & 0xF0
         if n.address == 0x02:  # very old 27 MHz protocol
             wpid = "00" + common.strhex(n.data[2:3])
@@ -267,13 +269,13 @@ def _process_hidpp10_notification(device, n):
         device.changed(active=link_established)
         return True
 
-    if n.sub_id == 0x49:
+    if n.sub_id == Notification.RAW_INPUT:
         # raw input event? just ignore it
         # if n.address == 0x01, no idea what it is, but they keep on coming
         # if n.address == 0x03, appears to be an actual input event, because they only come when input happents
         return True
 
-    if n.sub_id == 0x4B:  # power notification
+    if n.sub_id == Notification.POWER:
         if n.address == 0x01:
             if logger.isEnabledFor(logging.DEBUG):
                 logger.debug("%s: device powered on", device)
diff --git a/lib/logitech_receiver/receiver.py b/lib/logitech_receiver/receiver.py
index b5b91ad60e..c8b8eed47d 100644
--- a/lib/logitech_receiver/receiver.py
+++ b/lib/logitech_receiver/receiver.py
@@ -35,6 +35,7 @@
 from . import hidpp10
 from . import hidpp10_constants
 from .common import Alert
+from .common import Notification
 from .device import Device
 
 logger = logging.getLogger(__name__)
@@ -230,7 +231,7 @@ def register_new_device(self, number, notification=None):
             raise IndexError(f"{self}: device number {int(number)} already registered")
 
         assert notification is None or notification.devnumber == number
-        assert notification is None or notification.sub_id == 0x41
+        assert notification is None or notification.sub_id == Notification.DJ_PAIRING
 
         try:
             time.sleep(0.05)  # let receiver settle