⊙ Power supply: Non-replaceable 3V lithium battery
⊙ Conform to BS5446-2:2003
⊙ 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
⊙ Automaic compensation design with automatic calibration for accurate sensitivity, suitable for long life operation, lower false alarm rate
⊙ 14 hours non-disturb function under lower battery status
⊙ Ceiling mounting, easy to install with mounting bracket
⊙ Size: Φ120 * 38mm