diff --git a/homeassistant/components/smartthings/sensor.py b/homeassistant/components/smartthings/sensor.py
index 9c544ea5d73..da4fa20526e 100644
--- a/homeassistant/components/smartthings/sensor.py
+++ b/homeassistant/components/smartthings/sensor.py
@@ -166,6 +166,8 @@ CAPABILITY_TO_SENSORS: dict[
             SmartThingsSensorEntityDescription(
                 key=Attribute.CARBON_MONOXIDE,
                 translation_key="carbon_monoxide_detector",
+                options=["detected", "clear", "tested"],
+                device_class=SensorDeviceClass.ENUM,
             )
         ]
     },
diff --git a/homeassistant/components/smartthings/strings.json b/homeassistant/components/smartthings/strings.json
index 9cfc6176d20..9076aa8b2b5 100644
--- a/homeassistant/components/smartthings/strings.json
+++ b/homeassistant/components/smartthings/strings.json
@@ -61,7 +61,12 @@
         "name": "Body weight"
       },
       "carbon_monoxide_detector": {
-        "name": "Carbon monoxide detector"
+        "name": "Carbon monoxide detector",
+        "state": {
+          "detected": "Detected",
+          "clear": "Clear",
+          "tested": "Tested"
+        }
       },
       "dishwasher_machine_state": {
         "name": "Machine state"