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home alarms & sensors

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motion sensors & detectors

Smart Alarms

Smart alarms are a class of security devices that work with your smartphone to protect your home or business. They can be set up to alert you to a variety of events, including the presence fire, smoke or carbon monoxide in the surrounding areas. Browse the top-ranked list of smart alarms below along with associated reviews and opinions.

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

    SKU: J36CLVSCTR

    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
    Save $5
    The previous price was $19.99

  2. 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

  3. Amazon - Echo Spot (2024 release), Smart alarm clock with vibrant sound and Alexa - Glacier White

    SKU: J39HW6SJRZ

    Product Description

    A sleek Glacier White smart alarm clock with Alexa, vibrant sound, display screen, and smart home integration.
    See all Smart Speakers
    Your price for this item is $49.99
    Save $30
    The previous price was $79.99

  4. Amazon - Echo Spot (2024 release), Smart alarm clock with vibrant sound and Alexa - Ocean Blue

    SKU: J39HW6RL4G

    Product Description

    An ocean blue smart alarm clock featuring Alexa, vibrant sound, customizable display, and smart home integration.
    See all Smart Speakers
    Your price for this item is $49.99
    Save $30
    The previous price was $79.99

  5. SimpliSafe - Smart Alarm Wireless Indoor Security Camera - White

    SKU: J362VFS8J2

    Product Description

    A wireless white indoor security camera with night vision, two-way audio, motion sensor, and app compatibility.
    See all Indoor Security Cameras
    Your price for this item is $112.99
    Save $37
    The previous price was $149.99

  6. Ring - Alarm 8-Piece Security Kit - White

    SKU: J36CLVS279

    Product Description

    A white, app-compatible security kit with motion detection, battery backup, and real-time alerts for home protection.
    See all Home Security Systems
    Your price for this item is $179.99
    Save $70
    The previous price was $249.99

  7. SimpliSafe - 8pc Outdoor Home Security System - White

    SKU: J362VFSGHT

    The cameras have clear video quality day and night, and the motion detection is accurate without constant false alarms.I love that it’s a complete package—base station, sensors, keypad, and cameras—so...

    Product Description

    An eight-piece white wireless security system with HD outdoor camera, motion detection, and 24/7 monitoring.
    See all Home Security Systems
    Your price for this item is $99.99
    Save $250
    The previous price was $349.99

  8. SimpliSafe - Smoke & Carbon Monoxide Detector - White

    SKU: J362VFS3VL

    Fire Alarm...Ring has a sensor next to fire alarm. This is all in one...This one of the few smoke alarms tied to a good inexpensive security system.

    Product Description

    A white, battery-powered detector that alerts you to smoke and carbon monoxide, compatible with Alexa and Google Assistant.
    See all Smoke & Carbon Monoxide Detectors
    Your price for this item is $69.99

  9. SimpliSafe - Smoke & Carbon Monoxide Alarm Listener - White

    SKU: J362VFSG67

    Product Description

    A white listener that connects to existing detectors for app alerts and professional fire or CO monitoring.
    See all Smoke & Carbon Monoxide Detectors
    Your price for this item is $44.99

  10. Zewa - Thermometer - White

    SKU: JXS52J8CKX

    Product Description

    A white digital forehead thermometer offering non-touch, 1-second readings with a three-color LCD and fever alarm.
    See all Health Monitoring & Testing
    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.