Wireless Home Door & Window Burglar Alarm System Security Alarm Installation 

Description:
100% brand new and high quality
Simply attach one piece to your door or window, and attach the other piece to the door or window frame.
 When someone opens the protected door or window, the unit instantly alerts you with a loud siren.
It also has an on/off switch so you can open your door or window to let in some fresh air if you want to.
Low power standby consumption.
no wiring required
105 db instant alarm
Battery:3 x LR-44 Button
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Package includes:
Burglar Alarm Device x 1 (Battery including)