diff --git a/platypush/entities/bluetooth/_device.py b/platypush/entities/bluetooth/_device.py
index 1407bb7a..25694489 100644
--- a/platypush/entities/bluetooth/_device.py
+++ b/platypush/entities/bluetooth/_device.py
@@ -1,4 +1,4 @@
-from typing import Dict, Iterable, List
+from typing import Iterable, List
 from typing_extensions import override
 
 from sqlalchemy import (
@@ -11,12 +11,6 @@ from sqlalchemy import (
 )
 
 from platypush.common.db import Base
-from platypush.plugins.bluetooth.model import (
-    MajorDeviceClass,
-    MajorServiceClass,
-    MinorDeviceClass,
-    ServiceClass,
-)
 
 from ..devices import Device
 from ._service import BluetoothService
@@ -80,7 +74,9 @@ if 'bluetooth_device' not in Base.metadata:
         }
 
         @property
-        def major_device_class(self) -> MajorDeviceClass:
+        def major_device_class(self):
+            from platypush.plugins.bluetooth.model import MajorDeviceClass
+
             ret = MajorDeviceClass.UNKNOWN
             if self._major_device_class:
                 matches = [
@@ -95,11 +91,13 @@ if 'bluetooth_device' not in Base.metadata:
             return ret
 
         @major_device_class.setter
-        def major_device_class(self, value: MajorDeviceClass):
+        def major_device_class(self, value):
             self._major_device_class = value.value.name
 
         @property
-        def minor_device_classes(self) -> List[MinorDeviceClass]:
+        def minor_device_classes(self) -> list:
+            from platypush.plugins.bluetooth.model import MinorDeviceClass
+
             ret = []
             for dev_cls in self._minor_device_classes or []:
                 matches = [cls for cls in MinorDeviceClass if cls.value.name == dev_cls]
@@ -110,11 +108,13 @@ if 'bluetooth_device' not in Base.metadata:
             return ret
 
         @minor_device_classes.setter
-        def minor_device_classes(self, value: Iterable[MinorDeviceClass]):
+        def minor_device_classes(self, value: Iterable):
             self._minor_device_classes = [cls.value.name for cls in (value or [])]
 
         @property
-        def major_service_classes(self) -> List[MajorServiceClass]:
+        def major_service_classes(self) -> list:
+            from platypush.plugins.bluetooth.model import MajorServiceClass
+
             ret = []
             for dev_cls in self._major_service_classes or []:
                 matches = [
@@ -127,7 +127,7 @@ if 'bluetooth_device' not in Base.metadata:
             return ret
 
         @major_service_classes.setter
-        def major_service_classes(self, value: Iterable[MajorServiceClass]):
+        def major_service_classes(self, value: Iterable):
             self._major_service_classes = [cls.value.name for cls in (value or [])]
 
         @property
@@ -142,11 +142,13 @@ if 'bluetooth_device' not in Base.metadata:
             ]
 
         @property
-        def known_services(self) -> Dict[ServiceClass, "BluetoothService"]:
+        def known_services(self) -> dict:
             """
             Known services exposed by the device, indexed by
             :class:`platypush.plugins.bluetooth.model.ServiceClass` enum value.
             """
+            from platypush.plugins.bluetooth.model import ServiceClass
+
             return {
                 child.service_class: child
                 for child in self.children
diff --git a/platypush/entities/bluetooth/_service.py b/platypush/entities/bluetooth/_service.py
index d0a17798..65a9b43d 100644
--- a/platypush/entities/bluetooth/_service.py
+++ b/platypush/entities/bluetooth/_service.py
@@ -1,7 +1,7 @@
-from typing import Union
-from typing_extensions import override
 from uuid import UUID
 
+from typing_extensions import override
+
 from sqlalchemy import (
     Boolean,
     Column,
@@ -12,11 +12,6 @@ from sqlalchemy import (
 
 from platypush.common.db import Base
 from platypush.entities import Entity
-from platypush.plugins.bluetooth.model import (
-    Protocol,
-    RawServiceClass,
-    ServiceClass,
-)
 
 if 'bluetooth_service' not in Base.metadata:
 
@@ -56,7 +51,7 @@ if 'bluetooth_service' not in Base.metadata:
         }
 
         @staticmethod
-        def to_uuid(value: Union[str, RawServiceClass]) -> RawServiceClass:
+        def to_uuid(value):
             """
             Convert a raw UUID string to a service class UUID.
             """
@@ -72,18 +67,18 @@ if 'bluetooth_service' not in Base.metadata:
                 return int(value, 16)
 
         @property
-        def uuid(self) -> RawServiceClass:
+        def uuid(self):
             """
             Getter for the service class UUID.
             """
             return self.to_uuid(self._uuid)
 
         @uuid.setter
-        def uuid(self, value: Union[RawServiceClass, str]):
+        def uuid(self, value):
             """
             Setter for the service class UUID.
             """
-            uuid: Union[RawServiceClass, str] = self.to_uuid(value)
+            uuid = self.to_uuid(value)
             if isinstance(uuid, int):
                 # Hex-encoded 16-bit UUID case
                 uuid = f'{uuid:04X}'
@@ -91,20 +86,24 @@ if 'bluetooth_service' not in Base.metadata:
             self._uuid = str(uuid)
 
         @property
-        def protocol(self) -> Protocol:
+        def protocol(self):
             """
             Getter for the protocol used by the service.
             """
+            from platypush.plugins.bluetooth.model import Protocol
+
             try:
                 return Protocol(self._protocol)
             except ValueError:
                 return Protocol.UNKNOWN
 
         @protocol.setter
-        def protocol(self, value: Union[str, Protocol]):
+        def protocol(self, value):
             """
             Setter for the protocol used by the service.
             """
+            from platypush.plugins.bluetooth.model import Protocol
+
             protocol = Protocol.UNKNOWN
             if isinstance(value, Protocol):
                 protocol = value
@@ -117,11 +116,13 @@ if 'bluetooth_service' not in Base.metadata:
             self._protocol = protocol.value
 
         @property
-        def service_class(self) -> ServiceClass:
+        def service_class(self):
             """
             The :class:`platypush.plugins.bluetooth.model.ServiceClass` enum
             value.
             """
+            from platypush.plugins.bluetooth.model import ServiceClass
+
             try:
                 return ServiceClass.get(self.uuid)
             except (TypeError, ValueError):