Best Buy: First Alert Plug-In Explosive Gas And Carbon Monoxide Alarm White & Gray GC01CN

Upgrade 4-in-1 Gas and Carbon Monoxide Detector Real-time monitoring of PPM, %LEL, °F and %RH Wide range of applications 2,Check the product daily to make sure the green light is always on. It is recommended to clean the detector weekly with a soft bristle brush or vacuum cleaner. 4,Do not install in very dirty, dusty or greasy places such as kitchens, garages and rooms. Oil, dust or household chemicals may contaminate or pollute the detector's sensor head and prevent the detector from functioning properly. 【3 Packs Upgrade Plug-in Combination Gas & Carbon Monoxide Detector】 Plug and play, easy to install, 4-in-1 sensor, real-time monitoring display and alarm. 【Temperature（°F） and Humidity Sensor】Real-time detection and display of temperature and humidity, let you know the environment in real time. 【85dB Alarm Sound】Combination gas and carbon monoxide detector will alert you immediately when the combustible gas or carbon monoxide concentration reaches the default value. 【Upgraded Design Round Color Screen】Color display with bigger and clearer digital display.