This product is easy to install. Simply attach the main unit to the door frame and the secondary unit to the door or both sides of the window. Align the secondary unit's arrow with the main unit's side marker. When someone illegally opens the door or window (separation of the main and secondary units exceeds 10mm), the alarm will emit a sound of over 90db to warn the intruder to leave. You can control the door or window by switching. It uses 3×1.5V LR44 button batteries (included in the unit).

The alarm is installed on the door or window. If a thief tries to open the door or window, the alarm will immediately emit an alarm sound. Just turn off the switch when not in use. The alarm uses magnetic control technology, has a long service life, and is easy to install. It is attached with adhesive tape, so no screws are needed, and it can be directly pasted and used! It does not damage household items! (It can also be installed in the computer case of a computer room to prevent the theft of computer hardware.)

Usage: It can be installed on doors and windows, with a switch. When the switch is turned on, if the door or window is opened, it will emit a loud alarm. When you go to sleep at night or are away from home or the office, turning on the alarm switch can help keep your property safe and prevent theft.

Instructions: The alarm consists of a large piece and a small piece. Place the alarm pieces parallel to each other in the middle of the gap between the two windows. The gap between the large and small pieces should not exceed 5mm (you can refer to the packaging for placement). The small piece has an arrow, which should be placed opposite to the arrow on the large piece, parallel to the large piece. If you want to prevent theft, close the windows and turn on the alarm switch. As long as the window is opened (that is, the gap between the large and small pieces exceeds 5mm), the alarm will emit a loud alarm sound, and the owner will take action immediately, capturing the thief on the spot or forcing them to flee.

Using high-quality three-cell LR44 or AG13 batteries.

Rarely leaks.

Sound intensity: 95 dB (measured at 30 cm)