General description Compact and efficient, the 4-Pack Home Security Door Alarm is designed to provide a reliable theft warning system. With a loud 110 dB alarm, it serves as an effective deterrent against intruders. This versatile alarm can be easily mounted on various types of doors and windows, including swing doors, rolling doors, and sliding doors, as well as on drawers, filing cabinets, safes, garages, RVs, offices, warehouses, and shops. Technical specifications Alarm dimensions: 56 x 30 x 17 mm Magnet bar dimensions: 35 x 10 x 10 mm Power supply: 3 LR44 batteries (included) Alarm sound level: 110 dB Installation Attach double-sided tape to the back of the alarm and the magnetic bar. Stick them firmly on the two sides of the door or window joint. Ensure the inverted V line of the two parts is aligned, with a distance of less than 1 cm between them. Usage 4 Working Modes: General alarm: Sounds when the door is opened and stops when closed. Continuous alarm: Sounds continuously