Multi-Sensors alarm provide you all common household hazardous emergencies detection and prevention 3-in-1 smoke heat and carbon monoxide combination alarm 4-Working Voltage: DC3V built-in lithium battery Battery life:10 years Alarm Temperature: 54-70 ℃/Min(Rate-of-Rise) Alarm sound:﹥85dB/3m CO Alarm density: 50ppm, alarms not activate within 120 minutes 50-100ppm, alarms within 90 minutes 100-300ppm, alarm with 40 minutes 300ppm,alarm within 3 minutes Product Size : Φ115mm×H53mm Execute Criterion: EN14604:2005 / EN50291-1:2018 / BS5446-2:2003