CARBON MONOXIDE ALARM: The 10-year electrochemical sensor detects dangerous carbon monoxide (CO) levels, alerting with 4 loud chirps and a flashing red light. With no intervention, it switches to Alarm in Absence mode, chirping until deactivated. LCD SCREEN: The LCD screen displays standby mode for current CO levels, active CO alarm, ‘AL’ alarm in absence, battery status, and ‘EOL’ end of life alert to indicate when the device needs to be replaced. BATTERIES INCLUDED: Each CO monitor comes with 2 replaceable AA batteries. A flashing amber ‘!’ and continuous chirping indicate a low battery. Replace the batteries to stop the warning. TRAVEL CARBON MONOXIDE DETECTORS: Each portable, free standing device measures 120 x 73 x 35.5 mm and includes an integrated mounting bracket and screws for optional wall mounting. SAFETY ASSURED: The FA6812 Fire Angel carbon monoxide alarm is CE marked and complies with the standards BS EN 50291-1:2018 and BS EN 50291-2:2019., Weight: 0.3196702799 pounds, Manufacturer: FireAngel