Features: Carbon monoxide alarms are used for carbon monoxide leakage and smoke detection. During the winter heating period, doors and windows are usually closed, and carbon monoxide gas in the air is not allowed to circulate. Increased insecurity, the use of carbon monoxide alarms can effectively prevent the occurrence of danger. 100% brand new and high-quality. It is stable and has great performance while using.Specification:Battery:3*AA BatteryWorking Humidity:4~38%Alarm Voice:85dB(3 Meters)Alarm Current:<80mAStatic Current:<80ALow Battery Alarm:Make a sound every 30sLCD Display:LbSize: Dia100mm*38mm/3.94*1.5inVoltage: 220V 50HzAlarm Concentration: 50PPM 60~90min;100 PPM 10~40min;300PPM 3minStatic Indicator:Green LED flickered every 30s Package List:5*CO Alarm Sensor15*AA Battery10*Screws10*Screw Socket Installation Note:Install at 30 cm below the roof of the room, or on top of the ceiling.The installation position should not be too close to the gas stove or smoking machine.Avoid smoke coming directly into the alarm.