Nedis Doorstep Window Alarm - glass break sensor - white

This ultra-thin glass break detector has an integrated window / door alarm which will activate when the window or door glass is broken or when the door / window is opened.The switches on the side of the alarm allow you to switch it on and off as necessary and to adjust the detection sensitivity.Its thin profile makes it ideal for mounting on a window or door.The alarm requires 2 x CR2032 batteries (included) which have an average life of one year. The alarm will indicate when the batteries are almost empty and you can press the "battery test" button at any time to check your batteries' status.No tools are required to fit the alarm: it has magnetic sensors and is equipped with double-sided tape (included). Stick the alarm on the glass of the door or window and place the magnetic sensors on the door or the frame and you are done.