RL Window and Door Magnetic Alarm, White, RL-9805H

This alarm device warns you of an intrusion, an opened door or window, or a movement at the point where it is fitted. It is a self-contained unit intended for homes, small shops, storerooms and offices, and needs no wiring back to a central panel. Test it after installation and check the batteries regularly, because a silent alarm gives a false sense of security. It is a deterrent and a warning device, not a substitute for a monitored security system.