diff --git a/pyproject.toml b/pyproject.toml
index 248fa82..82d132f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "dueros_smarthome"
-version = "0.0.11"
+version = "0.0.12"
 authors = [
   { name="Shaoyu Zhang", email="zsy056@gmail.com" },
 ]
diff --git a/src/dueros_smarthome/models.py b/src/dueros_smarthome/models.py
index 3c7201e..1c0ac74 100644
--- a/src/dueros_smarthome/models.py
+++ b/src/dueros_smarthome/models.py
@@ -297,7 +297,7 @@ def __init__(self, value: int, kelvin_min: int = '2700', kelvin_max: int = '6500
     
     @property
     def in_kelvin(self) -> int:
-        return self._kelvinMin + (self._kelvinMax - self._kelvinMin) * (self._value - self._min + 1) / (self._max - self._min + 1)
+        return self._kelvin_min + (self._kelvin_max - self._kelvin_min) * (self._value - self._min + 1) / (self._max - self._min + 1)
 
     @property
     def percentage(self) -> int: