HIGH SENSITIVITYThe carbon monoxide alarm uses a high-tech electrochemical sensor that can quickly detect dangerous levels of carbon monoxide and sound an alarm. At the first time, eliminate hidden dangers for you and protect your and your family's life. You can install it in your bedroom or living room. QUALITY CERTIFICATIONThis carbon monoxide alarm has been strictly tested and certified to meet European standard EN 50291. When dangerous levels of carbon monoxide are detected, the carbon monoxide alarm will sound an 85 decibel alarm and flash a red LED to alert you. ALARM STANDARDAlarm time depends on carbon monoxide concentration level. 50 ppm, alarm within 60-90 minutes; 100 ppm, alarm within 10-40 minutes; 300 ppm, alarm within 3 minutes. COMPACT AND LIGHTWEIGHT The portable carbon monoxide alarm has a stylish appearance and a small body, which can be placed anywhere in your home without no feeling of disobedience. It can be used at home or carried at any time during the trip, avoiding outdoor fires and ensuring your safety, it is a reliable device. LCD DISPLAY The monoxide alarm can display the carbon monoxide concentration data on the LCD display by measuring the carbon monoxide concentration. "Err" on the LCD indicates a device failure. "Lb" on the LCD means the battery is low and needs replacing, "999PPM", "999PPM" on the LCD means the CO level is over 999ppm. Features: Material: ABS Packing List: 1 x Mini Carbon Monoxide Alarm carbon 2 x screws Notes: The carbon monoxide alarm sounds an alarm of 85 decibels within a radius of of 100 square meters in an open environment without obstacles. The alarm can be heard clearly and the audible range depends on the environment.