1.Easy to install with mounting hardware included
2.9VDC battery
3.Suitable for any room
4.Flash alarm indicator (red)
5.Test button for easy recommended monthly testing
6.Low battery signal
7.Safety clip feature, not allow mounting of smoke alarm without battery installed
electric  chamber for early detection from all directions
9.Loud 85dB alarm signal

Technical parameter

 Power Source : 9VDC battery 
Operating Current : 10 uA (normal) and 20-50 mA
(alarm working)
Sensitivity to smoke : In comply with UL217 &
BS5446: Part 1 2000
Kitemark 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. 
Size: 110mmX25mm
Box size :34cmX57cmX42.5cm;
q'ty/box:115pcs,
weight:17.3kg/box