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home alarms & sensors

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motion sensors & detectors

Alarm System Accessories

Enhance your home security setup with our extensive range of alarm system accessories. Whether you're looking to upgrade your existing system or add new functionalities, you'll find a variety of options designed to meet your needs. From motion sensors and keypads to smart alarms and sirens, these accessories are crafted to seamlessly integrate with your current security solutions. Perfect for both residential and commercial settings, our selection ensures you can customize your protection plan with ease and confidence. Explore the possibilities and take control of your safety with the right Alarm System Accessories today.

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  1. Ring - Alarm Motion Detector (2nd Gen) (2-Pack) - White

    SKU: J36CLVSCT4

    Product Description

    A pair of white, battery-powered motion detectors offering easy installation and instant security alerts via app.
    See all Motion Sensors & Detectors
    Your price for this item is $59.99

  2. 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

  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

    Very easy to install and compliments one of the best alarm systems. Also very reasonable accessories. ...Alarm system...I love my new alarm system that’s to my sales person good looking out on this 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

    Purchased my mom a alarm system and she needed a couple extra entry alarms and best buy was cheaper then buying off there website. ...It's super easy to install to add to your already existing system....

    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. Compustar - Vehicle Alarm Add-on Kit for Remote Start Systems - Black/Gray

    SKU: J3P5Z3C2G6

    Product Description

    An add-on kit in black and gray that upgrades remote start systems with enhanced vehicle security and voice alerts.
    See all Remote Start & Security Systems
    Your price for this item is $119.99

  7. Ring - Alarm Keypad (2nd Gen) - White

    SKU: J36CLVSCRV

    Product Description

    A white indoor keypad with wireless access, rechargeable battery, and emergency buttons for flexible home security.
    See all Home Security Systems
    Your price for this item is $24.99
    Save $25
    The previous price was $49.99

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

    SKU: J39HW69Z65

    Alarm System...I absolutely love my Ring Alarm System! User-Friendly, Easy to operate/install and I now have a greater sense of security in my home.

    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

  9. SPT - Jumbo Siren Indoor Strobe Box (2-Pack)

    SKU: J3GTZG9C48

    Product Description

    A weatherproof indoor strobe box alerts intruders and neighbors with a loud siren and flashing LEDs.
    See all Door & Window Alarms
    Your price for this item is $65.00

  10. Directed Electronics - T-Harness for Select Scion and Toyota Vehicles - Black/White

    SKU: J7Q8KPXTPQ

    Product Description

    A black and white T-harness enabling easy remote start system installation for select Toyota and Scion vehicles.
    See all Remote Start & Security Systems
    Your price for this item is $69.99
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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.