home security smoke detector 1.9V battery 2.Low power alarm 3.ceiling mounted CE Approved Battery Operated home security smoke detector Standalone surface mounted, easy operateBuilt-in IC card, stable performance, high sensitivityApply optical smoke test roomWith buzzer, alarm independently9V battery, static current: ≤10uA, alarm current: ≤12mALow power alarmAlarm volume: ≥85dBTemperature range: ...