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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MC-33C NC Magnetic Reed Switch Recessed Door Window Alarm, Magneti Door Switch, Contact Sensor, for Home Security and Burglar Alarm Systems, Sets of 10, White
Regular price $61.98 USDRegular priceSale price $61.98 USD -
Magnetic Reed Switch RC-31 NC Surface Mount Door Window Alarm, Magneti Door Switch, Contact Sensor, for Home Security and Burglar Alarm Magnetic Reed Switch,Sets of 6
Regular price $11.98 USDRegular priceSale price $11.98 USD -
TECKNET Door Alarms for Kids Safety, Door Alarms When Opened, Window Alarm with Smart Voice Alert, 4-Level Adjustable Volume, Refrigerator Sensor Pool Alarm for Home Security、Fridge and Window, 2Pcs
Regular price $14.98 USDRegular priceSale price $14.98 USD -
YoLink Door and Window Sensor Kit: 4-Pack + Hub
Regular price $131.98 USDRegular priceSale price $131.98 USD -
Seco-Larm SM-300Q/W Pack of 2 Screw-Terminal Surface-Mount N.O. Magnetic Contacts, White; 1/2" Gap; ABS Case; Gold Plated Contacts; UL Listed; Reliable Security Door/Window Sensor
Regular price $37.96 USDRegular priceSale price $37.96 USD -
WiFi Home Security System, 12-Piece Wireless Alarm Kit with Door Sensors
Regular price $179.98 USDRegular priceSale price $179.98 USD -
Magnetic Reed Switch RC-36 NC Recessed Wired Door Window Alarm, Magneti Door Switch, Contact Sensor, for Home Security and Burglar Alarm Magnetic Reed Switch,Sets of 5
Regular price $18.78 USDRegular priceSale price $18.78 USD -
UHPPOTE Magnetic Contact Sensor Normally Open Closed NC NO for Door Alarm Window - DC5V DC12V DC24V Light (Pack of 5)
Regular price $66.00 USDRegular priceSale price $66.00 USD -
20 Sets NC Magnetic Contacts Window Door Sensor Surface-Mounted Reed Switch Alarm with Double Side Tape
Regular price $39.98 USDRegular priceSale price $39.98 USD -
Magnetic Reed Switch RC-36 NC Recessed Wired Door Window Alarm, Magneti Door Switch, Contact Sensor, for Home Security and Burglar Alarm Magnetic Reed Switch,Sets of 2
Regular price $14.38 USDRegular priceSale price $14.38 USD -
Door Window Alarm, 90dB Wireless Sensor Door Window Burglar Alarm for Home Security, Kids Safety and Office, Garage, Apartment, House, Easy Installation (7)
Regular price $17.98 USDRegular priceSale price $17.98 USD -
Zigbee Door and Window Sensor, Wireless Mini Contact Sensor for Home Automation, Hub Required, Compatible with Home Assistant MQTT, SmartThings & Alex Echo Built-in Zigbee Hub
Regular price $31.98 USDRegular priceSale price $31.98 USD -
Vibration Door Window Alarm 2-Pack, 120dB, Rechargeable for Home Security
Regular price $33.98 USDRegular priceSale price $33.98 USD -
5 Sets Door Sensor Cover Compatible with Ring (Color Matching), Snap-On Design for Ring 1st/2nd Gen Sensors, Strong Protective to Hide White Sensor, Upgrade Home Security Aesthetics - Black
Regular price $39.90 USDRegular priceSale price $39.90 USD -
Door Window Alarm, 90dB Wireless Sensor Door Window Burglar Alarm for Home Security, Kids Safety and Office, Garage, Apartment, House, Easy Installation
Regular price $27.98 USDRegular priceSale price $27.98 USD -
Magnetic Reed Switch RC-35 NC/NO Recessed Wired Door Window Alarm, Magneti Door Switch, Contact Sensor, for Home Security and Burglar Alarm Magnetic Reed Switch, Sets of 2
Regular price $25.98 USDRegular priceSale price $25.98 USD