The door and window entry alarm is easily mounted by adhesive tape to window or door. Magnetic sensor switch detects entry for protecting your home or office whenever you are in or not. It is operated by 3 PCS 1. 5v LR44 button cell ( Battery included in package). It can protect your home or office from unauthorized entry.

This is a battery operated small item. It is placed on window or door, a siren will activate when there is an intruder.

Easy installation 
90+ db instant alarm
No wiring required
Secure door/windows