Security System for Your Home - 120 DB Siren alarm not only can cause huge shock to thieves, but also wake you up from sleep to prevent horrible accident. A door and window alarm with wide applications, forcible entry warning, ideal for home, office, hotel, apartments, garages, dorm room, or even RV. Keep Your Kids Safe Safe - This magnetic wireless sensor door and window alarm is powerful enough to detect entry, it lets you know when your children open the doors or windows to prevent children and babies from leaving, whether you are outside. inside or outside the house. (audible distance up to 750 ft / 230 m). Especially, if you have a swimming pool at home, it is very necessary to install a door alarm. Smart Design and Easy to Use - Size: 6.4x4.25x1.7cm, door and window alarm with a smart size, alarm sound:>120 dB, unique ultra-slim door and window alarm, design with 3 adjustable settings (on / off / set). Alarm Triggered by Magnetic Wireless Sensor: Alarm Triggered after Entry Door or Window Open. Easy to Install with Double Sided Adhesive Tape - Easily mounted on window or door by adhesive tape. No wiring needed! No screws needed! You can mount this alarm on all windows and doors, drawers, doors and other flats. Simple Operation with Batteries Includes - Shackcom door and window alarm runs on a set of 3 LR44 button cell batteries, for each alarm there is There are 3 LR44 button batteries inside the product, moreover, we give 10 extra batteries. When the alarm goes low, you should replace the batteries to better protect your home.