Ensure the safety of people and property: The volume of door and window alarms reaches 130dB, which will sound after the door is opened, which not only can cause a huge shock to thieves, but also let you wake up while you sleep to prevent horrible accident. A door and window alarm with wide applications, ideal for home, office, hotel, apartments, garages, dorm room, or even RV. Use the remote control to control four functions: Alarms of door and window are powerful. You can use the remote control to arm, disarm, change ringtones and emergency functions. It's very useful. You can adjust according to different scenarios, and even press the emergency function. The alarm sounds directly and can be used when calling for help in an emergency. Durable and long standby time: the burglar alarm can be used for one year without changing the battery frequently. When the battery voltage (each door alarm including 2 AAA batteries) is lower than 2.1V, a beep will sound. Don't worry about not working. This battery is easy to buy and replace.Our siren comes with batteries. Working principle: When the closing distance between the host and the magnetic strip is less than 1cm, no alarm sound will not be issued; when the separation distance between the host and the magnetic stripe is more than 1cm, an alarm sound will be emitted. Therefore, when someone opens the door or window illegally (the host is separated from the magnetic strip), the alarm will immediately emit a high pitched sound. Easy to Install with Double Sided Adhesive Tape - Comes with double-sided adhesive tape.Easily mounted on the window or door by adhesive tape. No wiring needed! No screws needed! You can install this alarm on all windows and doors, drawers, doors and other flats. PS: The remote control can be used in an open space at a distance of about 15m.