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door & window alarms

Window Alarm Sensor

You've heard it before: Burglars can sneak into your home through a window that's left open an inch or two. If you're worried about this, consider installing a window alarm sensor, which triggers an alarm if the window is opened and there's no one at home to hear it. The sensors are easy to install and work with any type of window, and they're sensitive enough to detect a slight breeze.

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  1. Ring - Alarm Security Kit 5-Piece (2nd Gen) - White

    SKU: J36CLVS273

    Product Description

    A white, app-compatible security kit with motion detection, battery backup, and easy setup for small homes.
    See all Home Security Systems
    Your price for this item is $199.99

  2. Ring - Alarm Contact Sensor (2nd Gen) (6-Pack) - White

    SKU: J36CLVS2GR

    Product Description

    A set of six white, battery-powered sensors for easy DIY door and window security with app alerts.
    See all Door & Window Alarms
    Your price for this item is $99.99

  3. Ring - Alarm Contact Sensor (2nd Gen) (2-Pack) - White

    SKU: J36CLVSCW6

    Product Description

    A pair of easy-to-install white sensors that alert you via app when doors or windows open.
    See all Door & Window Alarms
    Your price for this item is $29.98
    Save $10
    The previous price was $39.99

  4. SimpliSafe - 1pack Entry Sensor - White

    SKU: J3L6GWR5Y9

    Add to my existing alarm system....Added additional sensors to my existing alarm system. Sensors were very easy to add. ...Replaced a faulty sensor...These sensors work great. I bought it to replace one...

    Product Description

    A discreet white entry sensor that easily installs on doors or windows for reliable home security monitoring.
    See all Motion Sensors & Detectors
    Your price for this item is $15.99

  5. SimpliSafe - 4pack Entry Sensor - White

    SKU: J362VFSXGR

    Sensor Review...Sensors work perfectly. Easy to setup and install....consider drilling sensors in place...Sticker fell off door within one months time. Thankfully, alarm wasn't set at the time, or we'd...

    Product Description

    A set of four white, battery-powered entry sensors for easy installation on doors or windows.
    See all Motion Sensors & Detectors
    Your price for this item is $54.99

  6. ecobee - SmartSensor for Doors and Windows (2-Pack) - White

    SKU: JXC53VLSZG

    I love how easy it is to setup and use. The sensors serve two purposes, a motion sensor and door sensor. ...They come with a QR code you scan from the app, pull the battery tab out and the app will pair...

    Product Description

    A white, battery-powered sensor that sends instant notifications when doors or windows are opened or closed.
    See all Door & Window Alarms
    Your price for this item is $79.99

  7. Ring - Alarm Security Kit 9-Piece (2nd Gen) - White

    SKU: J39HW69Z65

    Rin alarm Pro...Alarm System

    Product Description

    A comprehensive white security kit featuring app compatibility, battery backup, and real-time alerts for home protection.
    See all Home Security Systems
    Your price for this item is $299.99

  8. Aqara - T1 Door and Window Sensor- Requires Hub product, Supports Apple HomeKit, Alexa, Google, SmartThings - White

    SKU: JJ8RHCJJVQ

    2/3 of The Sensors Work...Best Buy SKUs for Aqara Products Mentioned: 6568829 T1 Sensor (Requires Hub)6568825 P1 Sensor Thread & Matter (No Hub)6568824 M2 Aqara Hub 6568833 FP2 Presence Detector (No Hub)...

    Product Description

    A white battery-powered sensor that detects door or window status and supports major smart home platforms.
    See all Door & Window Alarms
    Your price for this item is $19.99

  9. Arlo - All-in-One Sensor with 8 sensing functions for Home Security System, 1 Pack - White

    SKU: JJ8QV84XTS

    Arlo Sensors...These sensors are the bees knees. They have more than one function packed into the sensor. ...sensor

    Product Description

    An all-in-one white sensor offering eight detection functions and easy app control for enhanced home security.
    See all Water & Temperature Sensors
    Your price for this item is $29.99
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In-store pricing may vary. Prices and offers are subject to change. © 2026 Best Buy. All rights reserved. BEST BUY, the BEST BUY logo, the tag design, and MY BEST BUY are trademarks of Best Buy and its affiliated companies.