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5 Sets Flush Mounted 3/4" Door Magnetic Contacts Alarm Switch Sensor NC Type (Black) 3/4" standard mounting diameter with self-locking clipRengu 
Garage Door Contact, Alarm Magnetic Magnetic Contact Alarm Magnetic Contacts Alarm Sensors for Home Garage Alarm Securit Easy to install and use. A good replacement for the old contacts. Simple to install no hasslesJoyzan 
Joyzan Magnetic Reed Switch Surface Mount Wired Door Contact Sensor Alarm Magnetic Reed Switch Window Security White Con Protective Switch for Window and Door: The magnetic reed switch, which are used to protect doors and window. They are grEMSea 
EMSea 4PCS Car Door Pin Switch ASW-18-3 20A 12VDC Compatible with Vehicle Interior Light Hood Trunk Alarm For cars and trucks, compatible with worn or faulty switches in interior light, hood security, or trunk alarm systems.Best Value WESUA 
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【AT-E】 Zigbee Smart Contact Sensor, Smart Home Security System, Home Automation,Safety Protection,Window/Door Sensor,Ins 🔔 Real-Time Door & Window Monitoring Instantly know when your doors or windows open or close. 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