Feature: 1. As a household gas leak detector, it uses high‑precision sensor technology to accurately monitor the leaked gas, making your living environment safer. 2. The gas detector provides voice notifications and digital readings. When the gas leakage concentration reaches a preset level, the LED screen will display the current concentration value and sound an audible alarm. 3. CO sensor has fault self‑check function, firstly press the self‑check button, the alarm will sound an alarm, the red indicator light flashes, and the LED screen displays the value, indicating that the alarm is normal. 4. The gas leak detector adopts an easy-to-install design and can detect leaking gas by plugging directly into the power socket. 5. This household gas detector adopts an energy-saving and low-power design method, plug and play, save electricity and time. Specification: Item Tape: Carbon Monoxide Alarm Material: ABS Uses: Household, commercial Voltage: 100-250V 50Hz Plug: U.S. standard Working Temperature: -10-50℃ Working Humidity: 5%-95% (RH) Detection Concentration Range: 0-20%LEL Alarm Concentration: 7%LEL Alarm Reset: Automatic reset after the combustible gas is cleared Display LED Light: Green shows normal, red shows alarm, yellow shows fault Alarm Mode: Sound and light alarm Installation Method: Wall-mounted. Package List: 1 x Alarm 2 x Screw 2 x Expansion Pipe 1 x Manul