Type : AR-WFA-CM-SD 
Power Supply : Battery 6F22 DC9V
Battery Life : 10 Month
Sound Specification : >85dB / 3m
Ambient Temperature : -10°C ~ 55°C
Humidity : 95% RH max (no condensation)
Standby current : >30uA
Alarm current : ≥35mA
Self test time : 60s
Installation : Ceilling