WiFi Graffiti Smart Smoke Alarm

Power supply: DC9V alkaline battery Quiescent current: <10uA Alarm current: <100mA Detection area: 20 Alarm sound:> 80dB Low battery alarm: ≦ 7.0 V ± 0.2 V Working temperature: 0 ℃ ~ + 50 ℃ Humidity: ≤95% rh,