Easily mounted by adhesive tape to window or door..
Magnetic sensor switch detects entry protection your home or office whether you are in or out.
Warning door/window sticker is supplied free in package.
Operated by 3 pcs,1.5v lr44 button cell(batteries in cluded in package).
1Use the double-side adhesive tape to fix the main unit at the side of the door/window.
Attachthe bar magnet to door frame/window frame with the arrow aligning with the refernce line of the
2.test the setup by switching the system's switch to "on" position of the main unit and see whether the
alarm can be triggered by opening the door /window.