... adopted;Anti-light,mothproof;Strong adaptability for circumstance Work-alone fire alarm smoke detector with 9V battery Work with fire alarm system, ... Button; Hush button2,Auto reset 3,ASIC adopted;Anti-light, mothproof;Strong adaptability for circumstance;4,SMT design, ... high stability5,Technical specification6,Operating voltage 9V battery 7,Alarm output sound and flash alarm8,Sound level ≥85dB3 meters ...