Includes two window/door alarms, each with three adjustable settings off/chime/alarmLoud 120-decible alarm sounds when door or window opens, helps deter intruder and alert residenceEasy and convenient to install, requires no wiring, mounting hardware and instructions included, designed for indoor use onlyBuilt-in low battery test button to easily check battery life, includes four LR44 batteries for each alarmComes with a 90-day limited warranty. Perfect for home, garage, apartment, dorm room, mobile home, RV, office and more