Collection: Door & Window Alarms
Explore alarms and contact sensors that indicate when doors or windows open. Check mounting requirements, sensor spacing, power sources, and hub compatibility before purchasing.
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eufy Security Entry Sensor, Detects Opened and Closed Doors or Windows
Regular price $59.98 USDRegular priceSale price $59.98 USD -
Garage Door Bracket, Compatible with Alarm Sensor 2nd Gen, White
Regular price $27.98 USDRegular priceSale price $27.98 USD -
MC-33C Normally Closed Recessed Window Door Contact Sensor Alarm Magnetic Reed Switch - (6 Sets)
Regular price $31.98 USDRegular priceSale price $31.98 USD -
Garage Door Brackets Compatible with Ring Alarm Contact Sensor 2nd Gen
Regular price $27.98 USDRegular priceSale price $27.98 USD -
5Pcs Magnetic Reed Switch, NC, 2 Wire, ABS White, MC-44b
Regular price $19.98 USDRegular priceSale price $19.98 USD -
2Pcs Magnetic Reed Switch Surface Mount, NC, 2 Wire, ABS, MC-38
Regular price $23.98 USDRegular priceSale price $23.98 USD -
5Pcs Magnetic Reed Switch Surface Mount, NO, 2 Wire, PVC, MC-31
Regular price $16.78 USDRegular priceSale price $16.78 USD -
Replacement Adhesive Pads for SimpliSafe Entry Sensors & Magnets
Regular price $17.80 USDRegular priceSale price $17.80 USD -
Magnetic Reed Switch Surface Mount, NC/NO, 3 Wire, PVC, MC-31
Regular price $15.58 USDRegular priceSale price $15.58 USD -
Honeywell Ademco 955PST-WH White Plunger Contact w/ Terminals
Regular price $29.00 USDRegular priceSale price $29.00 USD -
10 Pack White 3/8" Plunger Contact Door Window Cabinet Alarm Switch Adjustable
Regular price $67.90 USDRegular priceSale price $67.90 USD -
3Pcs Magnetic Reed Switch Surface Mount, NO, 2 Wire, ABS, MC-38
Regular price $26.58 USDRegular priceSale price $26.58 USD -
MC-31 Surface Mount Wired NC Door Contact Sensor Alarm Magnetic Reed Switch White 10pcs (Pack of 2)
Regular price $40.76 USDRegular priceSale price $40.76 USD -
Alarm Magnet Riser | 5 Pack Set with 3M Adhesive - Easy Mount to Any Doorway, Window, and Entryway | Sensor/Magnet Not Included (3/4 inch)
Regular price $35.98 USDRegular priceSale price $35.98 USD -
MC-31 Surface Mount Wired NC Door Contact Sensor Alarm Magnetic Reed Switch White 10pcs
Regular price $23.98 USDRegular priceSale price $23.98 USD -
Magnetic Reed Switch NC Surface Mount Wired Door Window Contact Sensor with Cover for Home Security and Burglar Alarm Systems MC-31 5pcs
Regular price $18.58 USDRegular priceSale price $18.58 USD