Adopts the sensor of reed switch and the technology of wireless remote control. Door magnetism alarm will issue a high volume with 120db when the thief opens the door. Instantly alerts you when doors opens. Handy remote lets you enter and exit. Speaker can be placed on anywhere with its screw hole attached. Powered by 3*AA battery (not included). Voltage: DC 4.5V. Volume: 120 DB. Reaction Mode: separate from magnetism. Remote Control Distance: Approx. 100 meters. Package Details Weight: 165.85 g Size: 22.5*13*3 cm Package Includes: Gate/Door Magnetic Alarm System Speaker Remote Control Magnetic Strip Set of Screws
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