(HIGH SENSITIVITY) This carbon monoxide alarm uses an advanced electrochemical sensor that quickly detects dangerous levels of CO and triggers an alarm. Eliminate hidden dangers and protect yourself and your family from the start. You can install it in your bedroom or living room. (QUALITY CERTIFICATION) This CO detector has been rigorously tested and certified to meet the European standard EN 50291. When dangerous levels of CO are detected, the CO alarm will sound an 85-decibel alarm and flash a red LED to warn you. (ALARM STANDARD) The alarm time depends on the concentration of CO. 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 CO detector has a sleek appearance and a small body, which can be placed anywhere in your home without being obtrusive. It can be used at home or carried with you when traveling to avoid outdoor fires and ensure your safety – a truly reliable device. (LCD DISPLAY) The CO detector can display CO concentration data on the LCD screen by measuring the CO concentration. "Err" on the LCD screen indicates a device error. "Lb" on the LCD screen means the battery is low and needs to be replaced. "999PPM" on the LCD screen means the CO level is over 999ppm. Features: Material: ABS Package List: 1 x Mini Carbon Monoxide Detector 2 x Screws Notes: The carbon monoxide detector emits an 85-decibel alarm within a radius of 100 square meters in an open environment without obstacles. The alarm can be heard clearly, and audibility depends on the environment.