Feature:1. Carbon Monoxide Excessive Concentration Alarm: The use of coal stoves for heating and cooking in sealed rooms, closed doors and Windows without ventilation measures to provide insufficient oxygen can produce large amounts of carbon monoxide gas and cause indoor poisoning.2. The LCD Screen Displays the CO Concentration: The number clearly shows the gas concentration to understand the leakage situation.3. Low Battery Warning: When the power supply drops to 3V, the buzzer will display a red flash every 20 seconds. After repeated alarm 15 times, the unit will stop working.4. Loud Sound and Light Alarm: 85dB high-pitched alarm precision alarm safety guard to prevent disaster.5. Alarm Standard: The alert time depend the level of carbon monoxide concentration. 50ppm, alert within 60~90 minutes; 100ppm, alert within 10~40 minutes; 300ppm, alert within 3 minutes. (Note: When you test the detector, please do not use gas blow the hole directly.)Specification:The detector uses an advanced electrochemical carbon monoxide sensor to accurately detect carbon monoxide levels regardless of its location in the room. Despite its small size, it offers strong conservation. Features:Carbon Monoxide Excessive Concentration Alarm: The use of coal stoves for heating and cooking in sealed rooms, closed doors and Windows without ventilation measures to provide insufficient oxygen can produce large amounts of carbon monoxide gas and cause indoor poisoning.The LCD Screen Displays the CO Concentration: The number clearly shows the gas concentration to understand the leakage situation.Low Battery Warning: When the power supply drops to 3V, the buzzer will display a red flash every 20 seconds. After repeated alarm 15 times, the unit will stop working.Loud Sound and Light Alarm: 85dB high-pitched alarm precision alarm safety guard to prevent disaster.Alarm Standard: The alert time depend the level of carbon monoxide concentration. 50ppm, alert within 60~90 minutes; 100ppm, alert within 10~40 minutes; 300ppm, alert within 3 minutes. (Note: When you test the detector, please do not use gas blow the hole directly.)Specifications:Material: ABSPower Supply: 3PCS AAA 1.5V(Not included)Sensor Type: ElectrochemicalType of Gas Sensed: Carbon monoxideDetecting Level Range: 000~999PPMSensitivity & Time:50ppm, alarms within 60~90 minutes100ppm, alarms within 10~40 minutes300ppm, alarm within 3 minutesStandby Current: 50uAAlarm Current: 75mAOperation Ambient Condition: -5~40, 20~90%RHHorn Level: 85dB at 1MItem Size: 78 * 48 * 25mm / 3.07 * 1.88 * 0.98inItem Weight: 55g / 1.94ozPackage Weight: 87g / 3.06ozPackage Size: 10.5 * 10.5 * 3.5cm / 4.13 * 4.13 * 1.37inPackage List:1 * Carbon Monoxide Detector2 * Screws2 * Anchor Plugs1 * User Manual (English)Package List:1 * Carbon Monoxide Detector2 * Screws2 * Anchor Plugs1 * User Manual (English)