【HIGH SENSITIVITY】The carbon monoxide alarm uses a high-tech electrochemical sensor that can quickly detect dangerous levels of carbon monoxide and sound an alarm. Eliminate hidden dangers early and protect your life and the lives of your family. You can install it in your bedroom or living room. 【QUALITY CERTIFICATION】This carbon monoxide alarm has been rigorously tested and certified to meet the 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 STANDARD】The alarm time depends on the carbon monoxide concentration level. At 50 ppm, the alarm will sound within 60 to 90 minutes; 100 ppm, alarm within 10 to 40 minutes; 300 ppm, alarm within 3 minutes. 【COMPACT AND LIGHTWEIGHT】 The portable carbon monoxide alarm has a sleek appearance and small body, which can be placed anywhere in your home without being obtrusive. It can be used at home or carried at any