MD-210R 433Mhz 868Mhz Window Vibration Detector Door Magnetic Sensor Low Battery Alert Only Compatible With Focus Alarm System - AliExpress
Focus 433Mhz Or 868Mhz Frequency MD-210R Door Window Detector Door Magnetic Sensor Alarm Built in Lithium Battery - AliExpress
Focus MD-210R 433/868mhz Security Detector Window Door Open Alarmimg Sensor Magnetic Contact
433Mhz 868Mhz MD 210R Window Detector Door Magnetic Sensor Low Battery Alert Only Compatible With Focus Alarm System From Tonytoppy, $23.22 | DHgate.Com
Focus 433Mhz Or 868Mhz Frequency MD-210R Door Window Detector Door Magnetic Sensor Alarm Built in Lithium Battery - AliExpress