NEDIS ALRMD20WT Window sensor White

The ultra-thin door/window alarm is designed to trigger a burglar alarm when a door or window is opened. A simple switch on the side of the unit allows it to be turned on and off as needed. Its thin profile makes it ideal for mounting on a window or door. The alarm requires 2 CR2032 batteries (included), the average battery life with normal use is one year. The alarm has an indicator light that shows if the battery is low. Press the "Battery Test" button on the front of the unit to check the battery status. The alarm unit is mounted with double-sided adhesive tape (included). Stick the alarm and magnetic sensor on the door or window and you are done.