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Labor Day SaleEnds September 7. Limited quantities. No rainchecks.Shop now

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Best Buy

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home security & monitoring

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door & window security

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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. SimpliSafe - 1pack Entry Sensor - White

    SKU: J3L6GWR5Y9

    Great Product!...I love my SimpliSafe system, and Best Buy helps me by stocking what I need. Thank you!...Love it...SimpliSafe is one of the best securities system in the market.

    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

  2. Ring - Alarm Contact Sensor (2nd Gen) (1-Pack) - White

    SKU: J36CLVSCTR

    Great...Great ZWave device!...This works great! Easy to set up with my home automation hub (Homey Pro).

    Product Description

    A white, battery-powered contact sensor that alerts you via app when doors or windows are opened.
    See all Door & Window Alarms
    Your price for this item is $14.99

  3. Aeotec - Z-Wave Plus v2 Door / Window Sensor 7 Pro, Gen7

    SKU: J3GZ9GRQ9S

    Product Description

    A discreet sensor that wirelessly monitors doors or windows and triggers alerts via Z-Wave automation.
    See all Door & Window Alarms
    Your price for this item is $78.23

  4. SimpliSafe - 4pack Entry Sensor - White

    SKU: J362VFSXGR

    Best Deal on Simpli Safe is at Best Buy...The best deal the best security system....Simpli safe wouldn’t honor the 4 pk pricing but Best Biy sure would. That’s why I love Best Buy...I love my SimpliSafe...

    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

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

    SKU: J36CLVS273

    Great Best Buy service! I like the system, it’s reasonably priced and easy to use....Great product, love it. Easy to install, easy to set up.

    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

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

    SKU: JJ8RHCJJVQ

    Love it!😍...Great...I really like this door sensor, it works great and the alarm is loud enough to hear throughout the house

    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 $17.99
    Save $2
    The previous price was $19.99

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

    SKU: JJ8QV84XTS

    Didn't need it but love it been upgrading my home and its been great...Best in the market.

    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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FAQ

A window alarm sensor typically detects the opening or breaking of a window using magnetic contact or vibration technology. When the window is opened or tampered with, the sensor triggers an alarm to alert you of potential unauthorized entry.

Yes, many window alarm sensors are compatible with popular smart home systems, allowing you to receive notifications and control the sensors remotely through a mobile app or smart hub.

Most window alarm sensors are designed for easy DIY installation, often featuring adhesive backing or simple mounting hardware. Detailed instructions are usually included to help you set up the device quickly.

Many window alarm sensors are battery-operated, making them wireless and easy to place anywhere on your windows. Some models may include batteries in the package or indicate the type required.

Yes, window alarm sensors are generally versatile and can be installed on various window types, including sliding, casement, and double-hung windows. Always check the product specifications for compatibility with your specific window style.