Alarm sound when the door or window is opened unexpectedly Compact and well-made design, easy to install and use Suitable for doors and windows in homes, shops, factories, warehouses, and other locations Small and sleek, includes double-sided adhesive tape for quick installation on doors or windows Affordable, reliable, and practical security solution Attach the main unit and magnetic strip to the door and frame, or to both sides of a window, aligning them with a gap of approximately 5 mm If the door or window is forced open (causing separation of the main unit and magnet), the alarm emits a loud 90 dB siren to deter intruders and alert nearby individuals Operate the device using the power switch when opening the door or window normally Ideal for防盗 in residential rooms, offices, counters, and similar areas Power supply: 2 x size 7 batteries (not included) Alarm sound level: 90 dB Installation: 1. Use the included double-sided tape to fix the main unit to the door or window 2. Attach the magnetic strip to the door frame, aligning it with the indicator line on the main unit 3. Set the switch to the "ON" position to activate the alarm 4. Test by opening the door or window to confirm the alarm sounds Color: White Material: ABS Package Contents: 1 x Alarm Unit Note: Light and display settings may cause slight variations in the color shown in images. Measurement may vary by +/- 1-3 cm.