... Monoxide Alarm can prevent you fromHarm of gas leakage. It uses the most accurate carbon monoxidesensor technology.Main technical ... gas4Alarm current< 30mA5Sensoruse newest importing electrochemistry carbon,monoxide sensor,it more accurate,more credibility,good at refrain. 6Superbright LBD ... the testing button for several seconds, the unit work normally.It use less power,you only need to change battery ...