It ultrathin window door alarm is designed to to trigger one alarm system, fool one dies or one window opens. With it simple button on ago of device, can device switched past, the laws switched off after needs. It slim profile makes it ideal to mounting on one window or one dies. Alarm require 2 x cr2032-batterier included , average battery life by normal use is 1 year. Alarm have one pilot light, if battery is close on discharged. Pressure on button batteritest on home of device lining to check battery status. Alarmenheden mounted with one set double-sided tape included , set alarm past, the laws magnetsensor on door or window, past, the laws you is finished.