1. [3-in-1 integrated CO detector] Our latest 3-in-1 carbon monoxide detector integrates carbon monoxide, temperature and humidity sensors, and refreshes in real time in 2 seconds to detect the environment for us. Tell us the potential carbon monoxide gas hazards in real time. 2. [Plug and Play Design] The US standard plug is compatible with 110V to 220V AC power outlets. Suitable for all US standard AC power outlets such as bedrooms, kitchens, living rooms, basements, hotel rooms, offices, etc. All data is displayed in real time on the 2.1-inch HD screen. 3. [Built-in 1000 mAh rechargeable backup battery] Provides 90-96 hours of working time, which helps to cope with sudden power outages. We can also use it as a portable carbon monoxide detector (short-distance 3-day trip). The rechargeable design can help you save the cost of buying disposable batteries multiple times. 4. We pay attention to all gas environments. Built-in independent carbon monoxide sensor that meets UL2034 standards, the HD screen is clearly visible, and the 85-decibel low-noise design can detect the gas environment in real time, bringing additional protection for you and your family. Create a whole-house early warning for you.