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Description:Features: 1) Wireless installation, wireless transmitter, DIY project 2) High quality PVC material for the plastic covers 3) High sensitive chips inside and strong anti-interfere 4) Battery supply power 5) LED indicator for Low voltage 6) Strong anti-interfere 7) DIY project 8) The gap between the two parts is apart beyond 15 - 20mm, it will be triggered and send signal to the main panel to alarm Specification 1) CE and CCC certified 2) Power: 12V battery 3) Working frequency: 315MHz / 433MHz 4) Gap for triggered, above 15 - 20mm 5) Stand-by current: 0.01W 6) Alarm current: 0.09W 7) Working temperature: -10 - 50°C 8) Relative humidity: below 95% 9) Size: 80 x 50 x 16mm 10) N.W.: 45g