... parameter: 1PowerDC9V battery2Standby current<= 35uA 3Alarm density150+/-50ppm CO gas4Alarm current< 30mA5Sensoruse newest importing electrochemistry carbon,monoxide sensor ... 20~95%R.H. 11standard:Electrochemistry CO alarm only use to detect CO gas.CO gas is one poisonous gas,without ... such as the burning environment of furnace,wood,coal, electric radiator, water heater.So to be safty,we suggest ...