diff --git a/midealocal/devices/cf/__init__.py b/midealocal/devices/cf/__init__.py
index 3715701e..739c6140 100644
--- a/midealocal/devices/cf/__init__.py
+++ b/midealocal/devices/cf/__init__.py
@@ -1,5 +1,6 @@
 import logging
 import sys
+from typing import Any
 
 from .message import MessageCFResponse, MessageQuery, MessageSet
 
@@ -36,7 +37,7 @@ def __init__(
         model: str,
         subtype: int,
         customize: str,
-    ):
+    ) -> None:
         super().__init__(
             name=name,
             device_id=device_id,
@@ -59,10 +60,10 @@ def __init__(
             },
         )
 
-    def build_query(self):
+    def build_query(self) -> list[MessageQuery]:
         return [MessageQuery(self._protocol_version)]
 
-    def process_message(self, msg):
+    def process_message(self, msg: bytes) -> dict[str, Any]:
         message = MessageCFResponse(msg)
         _LOGGER.debug(f"[{self.device_id}] Received: {message}")
         new_status = {}
@@ -72,7 +73,7 @@ def process_message(self, msg):
                 new_status[str(status)] = getattr(message, str(status))
         return new_status
 
-    def set_target_temperature(self, target_temperature, mode):
+    def set_target_temperature(self, target_temperature: int, mode: int) -> None:
         message = MessageSet(self._protocol_version)
         message.power = True
         message.mode = self._attributes[DeviceAttributes.mode]
@@ -81,7 +82,7 @@ def set_target_temperature(self, target_temperature, mode):
             message.mode = mode
         self.build_send(message)
 
-    def set_attribute(self, attr, value):
+    def set_attribute(self, attr: str, value: Any) -> None:
         message = MessageSet(self._protocol_version)
         message.power = True
         message.mode = self._attributes[DeviceAttributes.mode]
diff --git a/midealocal/devices/cf/message.py b/midealocal/devices/cf/message.py
index 7c3ade08..fd8f61d8 100644
--- a/midealocal/devices/cf/message.py
+++ b/midealocal/devices/cf/message.py
@@ -7,7 +7,9 @@
 
 
 class MessageCFBase(MessageRequest):
-    def __init__(self, protocol_version, message_type, body_type):
+    def __init__(
+        self, protocol_version: int, message_type: int, body_type: int
+    ) -> None:
         super().__init__(
             device_type=0xCF,
             protocol_version=protocol_version,
@@ -16,12 +18,12 @@ def __init__(self, protocol_version, message_type, body_type):
         )
 
     @property
-    def _body(self):
+    def _body(self) -> bytearray:
         raise NotImplementedError
 
 
 class MessageQuery(MessageCFBase):
-    def __init__(self, protocol_version):
+    def __init__(self, protocol_version: int) -> None:
         super().__init__(
             protocol_version=protocol_version,
             message_type=MessageType.query,
@@ -29,12 +31,12 @@ def __init__(self, protocol_version):
         )
 
     @property
-    def _body(self):
+    def _body(self) -> bytearray:
         return bytearray([])
 
 
 class MessageSet(MessageCFBase):
-    def __init__(self, protocol_version):
+    def __init__(self, protocol_version: int) -> None:
         super().__init__(
             protocol_version=protocol_version,
             message_type=MessageType.set,
@@ -42,11 +44,11 @@ def __init__(self, protocol_version):
         )
         self.power = False
         self.mode = 0  # 1 自动 2 制冷 3 制热
-        self.target_temperature = None
-        self.aux_heating = None
+        self.target_temperature: int | None = None
+        self.aux_heating: bool | None = None
 
     @property
-    def _body(self):
+    def _body(self) -> bytearray:
         power = 0x01 if self.power else 0x00
         mode = self.mode
         target_temperature = (
@@ -61,7 +63,7 @@ def _body(self):
 
 
 class CFMessageBody(MessageBody):
-    def __init__(self, body, data_offset=0):
+    def __init__(self, body: bytearray, data_offset: int = 0) -> None:
         super().__init__(body)
         self.power = (body[data_offset + 0] & 0x01) > 0
         self.aux_heating = (body[data_offset + 0] & 0x02) > 0
@@ -81,8 +83,8 @@ def __init__(self, body, data_offset=0):
 
 
 class MessageCFResponse(MessageResponse):
-    def __init__(self, message):
-        super().__init__(message)
+    def __init__(self, message: bytes) -> None:
+        super().__init__(bytearray(message))
         if (
             self.message_type in [MessageType.query, MessageType.set]
             and self.body_type == 0x01