... Hand/Auto-reset LED Alarm,Best Adaptability with Environment,CE, ROHS Smoke detector,Test function & Low voltage alarm functionFeatures: 1) Power source: DC 9V ... and AC 220V 2) Working current: : Surveillant current<15?, alarm current: <30mA 3) Alarm sound: >85dB 4) Ambient temperature: -10 ~ 50 centigrade ...