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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Seco-Larm SM-4301-TQ/W Pack of 2 Enforcer Recessed-Mount Magnetic Contacts, White; Plunger Type; 1/4 Inch Travel; Iridium Reed; Slim Security Switch; for Protecting Sliding Doors and Windows
Regular price $37.78 USDRegular priceSale price $37.78 USD -
QWORK MC-31 Wired Surface-Mounted NC Magnetic Door Window Contact Sensor Alarm Reed Switch, White, Pack of 10 with 40 Screws
Regular price $18.48 USDRegular priceSale price $18.48 USD -
Seco-Larm SM-4301-TQ/W Pack of 3 Enforcer Recessed-Mount Magnetic Contacts, White; Plunger Type; 1/4 Inch Travel; Iridium Reed; Slim Security Switch; for Protecting Sliding Doors and Windows
Regular price $39.28 USDRegular priceSale price $39.28 USD -
QWORK MC-31 NC Wired Magnetic Door Window Contact Sensor, 20 Pack with 80 Screws, Surface-Mount White Plastic Alarm Reed Switch for Doors Windows Cabinets
Regular price $34.94 USDRegular priceSale price $34.94 USD -
Seco-Larm SM-4301-TQ/W Pack of 4 Enforcer Recessed-Mount Magnetic Contacts, White; Plunger Type; 1/4 Inch Travel; Iridium Reed; Slim Security Switch; for Protecting Sliding Doors and Windows
Regular price $47.90 USDRegular priceSale price $47.90 USD -
10pcs Surface Mount Alarm 10W 100V 0.5A in Max Magnetic Contact Ideal for Door Window Security with Lead Wire and 3M Adhesive Paper
Regular price $29.98 USDRegular priceSale price $29.98 USD -
SimpliSafe Entry Sensor (Pack of 4) - Window and Door Protection - Compatible with The SimpliSafe Home Security System - Latest Gen
Regular price $109.98 USDRegular priceSale price $109.98 USD -
Seco-Larm SM-4301-TQ/W Enforcer Recessed-Mount Magnetic Contact, White; Plunger Type; 1/4 Inch Travel; Iridium Reed; Slim Security Switch; for Protecting Sliding Doors and Windows
Regular price $21.40 USDRegular priceSale price $21.40 USD -
10 Sets Magnetic Reed Switch MC-31 NC Surface Mount Wired Security Window Door Contact Sensor Alarm Magnetic Reed Switch, for Home Security and Burglar Alarm Systems
Regular price $31.98 USDRegular priceSale price $31.98 USD -
4 in 1 Door Chime When Door Opens Alarm Sensor for Kids Home and Business
Regular price $68.34 USDRegular priceSale price $68.34 USD -
Wyze Home Security System Wireless Keypad,White
Regular price $79.96 USDRegular priceSale price $79.96 USD -
Magnetic Door Switch RC-33 NC Recessed Wired Security Window Door Contact Sensor Alarm White - (10 Sets)
Regular price $25.98 USDRegular priceSale price $25.98 USD -
4PCS Recessed Wired Door Contact Sensor, NC, ABS White, RC-33
Regular price $25.98 USDRegular priceSale price $25.98 USD -
Wyze Home Security System Motion Sensor (1-Pack) Wyze Sense Hub Required
Regular price $49.96 USDRegular priceSale price $49.96 USD -
2-Pack Garage Door Bracket for Ring Alarm Contact Sensor 2nd Gen
Regular price $27.98 USDRegular priceSale price $27.98 USD -
2PCS Recessed Wired Door Contact Sensor, NC, ABS White, RC-33
Regular price $13.18 USDRegular priceSale price $13.18 USD