GE Personal Security Window/Door Alarm, DIY Home Protection, Burglar Alert, Magnetic Sensor, Off/Chime/Alarm, Easy Installation, Ideal for Home, Garage, Apartment, Dorm, RV and Office, 56789 Sounds alarm when door or window opens, helps deter intruder and alert residence Includes one 120-decibel window/door alarm with three adjustable settings off/chime/alarm Easy and convenient to install, requires no wiring. All mounting hardware included, for indoor use only Low battery test button to easily check battery life, includes 1 Lr44 battery for each alarm Perfect for home, garage, apartment, dorm room, mobile home, RV, office and more