DOOR AND WINDOW HOME SECURITY ALARM,HIGH POWER ALARM
Easy to install--just peel and stick.
Alarm is activated when the two pieces are separated .(refer to the following picture)

Technical Parameter:
Power supply: DC one 9V 6F22 battery (not included)
Quiescent current: 3~6uA
Temperature: -10°C ~ +50°C
Alarm decibel: 120dB instant alarm
Size: Main frame: 100x52x23mm
      Magnetic box: 55x12x11mm
Color:white

Applicable scope : Ideal entry warning for homes, apartments,  mobile homes, dorms, offices, hotel rooms, garages, and more!
1.Install one piece of 9V batteries in the alarm.(please check the polarity of the battery)
2.Easily mounted to windows or doors with included mounting tape
3.Convenient on/off switch
4.When the volume becomes low obviously,please change the battary immediately.If you don't use the alarm in a long time,please take off the battary.