Giới thiệu Chuông Báo Động Chống Trộm Gắn Cửa 105db
Description: Material: plastic. Size: 53*35*20mm. Color: show as pictures. Powered by 3*AG13 battery(included). Features: * Magnetic sensor switch detects entry protecting your home or office whether you are in or out. * Easily mounted by adhesive tape to window or door. * Power by 3 x 1.5V LR44 button batteries(included). * When people illegally open the case or windows, the alarm and attachment are separated, the alarm could be a strong siren to deter thieves. * Widely used in internet bar, residence, office and store. The alarm volume could reach 105 dB. Operation: * Use the double side adhesive tape to fix the main unit at the side of the door / window. * Attach the bar magnet to door frame / window frame with the arrow aligning with the reference line of the main unit. * Test the setup by switching the system to "ON" position of the main unit and see whether the alarm can be triggered by opening the door / window
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