... Alarm can prevent you fromHarm of gas leakage. It uses the most accurate carbon monoxidesensor technology.Main technical parameter: 1PowerDC9V ... it with facial features. It mostly exist the places which short of air,such as the burning environment of furnace,wood,coal, electric ... in kitchen,wash room,dinning room,bedroom,,garage etc.When the unit detector gas leakage,it will alarm with 85db ...