9VDC HEAT ALARM Ceiling or wall mounting Easy installation 9V battery operated (included) Detection of intense fires with fast response. Flash alarm indicator (red) Self-test function Low battery signal Safety-clip feature, not allow mounting of the heat alarm without battery installed] High stability and reliability Loud 85dB alarm signal SPECIFICATIONS : Power Source : 9V battery (included) Relative Humidity : 10% ~ 95% Operating Current : <100uA (standby) and 10-15mA (alarm working) Horn level : 95dB within 1 meter