stand-alone smoke detector, when it detect the smoke, it will sound&flash. Easy to install,long-life

Stand-alone smoke detector 

Features:
Ceiling or wall mounting
Easy to install with mounting hardware included 9VDC battery
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 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 : -10 to +50
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