※ Power supply: Non-replaceable 3V lithium battery
※ Conform to EN14604:2005/AC:2008
※ Alarm volume: ≥85dB at 3m
※ Big test button for easily weekly testing
※ Product life time > 10 years
※ Low battery signal alarm
※ Silence function: Approx.8 mins
※ Automatic compensation design with automatic calibration for accurate sensitivity, suitable for long life operation, lower false alarm rate
※ 10 hours non-disturb function under lower battery status
※ Ceiling mounting, easy to install with mounting bracket
※ Safety clip feature, not allow mouting without battery installed
※ Size: Φ120 * 38mm