Best adaptability with environment,Manual test & retest function,Easy to install with mounting hardware included,good quality.

* Power110VAC/220VAC/230VAC( backup 9v battery)9v battery12V-25DC* Ceiling or wall mounting* Easy to install with mounting hardware included* 110VAC/230VAC with 9VDC battery backup* Suitable for any room* Flash alarm indicator (red)* Test button for easy recommended monthly testing* Low battery signal* Safety clip feature, not allow mounting of smoke alarm* without battery installed* photoelectric  chamber for early detection from all directions* Loud 85dB alarm signalSpecifications:* Power Source : 110VAC/230VAC with 9VDC battery backup* Operating Current : 10 uA (normal) and 20-50 mA  (alarm working)* Sensitivity to smoke : In comply with UL217 &* BS5446: Part 1 2000* Kite mark License no. KM 53166.  0.81~1.42%/FT  Operating Temperature: 40oF - 100oF (4. 4C - 37.8oC)  Ambient Humidity : 10% - 90%.* Horn Level: 85 Decibels at 10 feet.* Battery life: 1 year min. * Interconnecting Gas detector     (1)Circuit for normally closed rely contacts   (2)Circuit for normally opened rely contacts  (3)Operating Frequency: 433 MHZ/315MHZ (optional)

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smoke detector