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Focus 433Mhz or 868Mhz Frequency MD 210R Magnetic Door Window Sensor Door Detector Alarm with Low Battery Alert|Alarm System Kits| - AliExpress
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433Mhz 868Mhz MD-210R Door Window Detector Door Magnetic Sensor Alarm Low Battery Alert Only Compatible With Focus Alarm System / Security Alarm
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4PCS each Lot MD 210R Door Window Sensor Door Detector Alarm with Low Battery Alert Compatible with Focus Alarm System|Alarm System Kits| - AliExpress
![Burglar Anti Thief MD 210R Wireless Door Window Magnetic Contact Switch Sensor Alarm/Home Security Protection 433MHz From Angel0530, $60.31 | DHgate.Com Burglar Anti Thief MD 210R Wireless Door Window Magnetic Contact Switch Sensor Alarm/Home Security Protection 433MHz From Angel0530, $60.31 | DHgate.Com](https://www.dhresource.com/0x0/f2/albu/g3/M00/85/27/rBVaHVUjULmANmVxAABkVpEs4Ak123.jpg/burglar-anti-thief-md-210r-wireless-door.jpg)