Heat Alarm 1-Thermistor 2-DC9V Battery Operated 3-Sounder With LED Flash signal 4-Below Fire Alarm System 1.Size:Φ103X53mm2.Power:DC9V battery3.Static current:≤10uA,4.Working current:10ma to 30mA,5.Humidity range:10% to 90%6.Alarm temperature:60 centigrade degree(can be changed according to customers requirement);7.Sound Alarm:≥85dB in 10 feet Fire Alarm Heat Detectors