Features:The LCD screen displays the CO concentration.Adopting high quality electrochemical CO sensor, it is more accurate, reliable and reproducible.Ultra-bright LED display: Flashing every 50 seconds to indicate standby status, fast flashing to indicate detector alarm.High volume buzzer output, up to 85 dB in 3 meters.Test/Reset button to test the unit electronics and verify proper operation of the unit and reset the unit during alarm.Green and red LED indicators indicate normal operation and alarm statusSpecifications:Standby current: 25uABattery: 3pcs x 1.5V Battery (NOT included)Alarm concentration:When the concentration is at 30 ppm, the alarm will sound within 120 minutes.When the concentration is at 50 ppm, the alarm will sound within 60 to 90 minutes.When the concentration is at 100 ppm, the alarm will sound within 10 to 40 minutes.When the concentration is at 300 ppm, the alarm will sound within 3 minutes.Alarm current: 50mASize: approx. 10 * 3.5cm / 3.9 * 1.4inchWeight: approx. 110g / 3.9ozPackage list:1 x CO alarm2set x screws