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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 hasslesDSYBJR 
5 Sets Flush Mounted 3/4" Door Magnetic Contacts Alarm Switch Sensor NC Type (Black) 3/4" standard mounting diameter with self-locking clipGAGALOR 
Heavy Duty Wired Magnetic Contacts Roller Shutter Door Reed Switch Sensor with Adjustable Bracket Suitable for roller shutter doors, garage doors. Metal zinc alloy housingBest Value WESUA 
WESUA Magnetic Switch Alarm Sensor Overhead Garage Door Contacts with L Bracket Alloy zinc material case make it quite sturdyBNYZWOT 
BNYZWOT Recessed Door Contacts NC Security Alarm Window Sensors With Magnetic Reed Switch. 3⁄4 Inch Door Contact Positio Product Name: Recessed Magnetic Door Swith; Color: White; Net Weight: 115g; Material: ABSJoyzan 
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 gr10% Off Elzenzhine 
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