Window Door Alarm 2 Pack Noopel Home Security Ultra-Slim Door and Window Alarms\n\nMagnetic door alarm sensor 120db alerts a person to a door or window opening.\nPrevent children going out the house without notice.Also ideal entry warning for your home,office,apartment,garage and so on.\nUltra-thin door and window alarm with 2 adjustable settings (off/on).3xLR44 batteries included.\nEasy installation,No wiring needed!No screws needed!Included double sided tape.\nUltra-sensitive also Low battery indicator to check battery life.This is a PERFECT AFFORDABLE compliment for your home security.