diff --git a/kasa/interfaces/fan.py b/kasa/interfaces/fan.py
index ade00928..9462ad88 100644
--- a/kasa/interfaces/fan.py
+++ b/kasa/interfaces/fan.py
@@ -3,8 +3,9 @@
 from __future__ import annotations
 
 from abc import ABC, abstractmethod
+from typing import Annotated
 
-from ..module import Module
+from ..module import FeatureAttribute, Module
 
 
 class Fan(Module, ABC):
@@ -12,9 +13,11 @@ class Fan(Module, ABC):
 
     @property
     @abstractmethod
-    def fan_speed_level(self) -> int:
+    def fan_speed_level(self) -> Annotated[int, FeatureAttribute()]:
         """Return fan speed level."""
 
     @abstractmethod
-    async def set_fan_speed_level(self, level: int) -> dict:
+    async def set_fan_speed_level(
+        self, level: int
+    ) -> Annotated[dict, FeatureAttribute()]:
         """Set fan speed level."""