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Electronic Alarm System

An alarm system is a security device for your home or business that alerts you to the presence of intruders, or sounds an alarm if the door is opened. Alarm systems are often used in conjunction with other home security devices, such as cameras and motion sensors. Browse the top-ranked list of electronic alarm systems below along with associated reviews and opinions.

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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 Motion Detector (2nd Gen) (1-Pack) - White

    SKU: J36CLVSCTG

    Product Description

    A battery-powered white motion detector that provides instant alerts and easy installation for enhanced home security.
    See all Motion Sensors & Detectors
    Your price for this item is $29.99

  3. 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

  4. 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 $249.99

  5. 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

  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. Security Upgrade for Viper DS4+ Remote Start Systems - Black

    SKU: J7Q8KPXQ8P

    I have always been a fan of Viper alarms. I was happy to find out that Viper redid the way they packaged their alarm systems...I purchased the Security Upgrade for Viper DS4+ Remote Start Systems for...

    Product Description

    A black security kit with a six-tone siren and shock sensor for enhanced vehicle theft protection.
    See all Remote Start & Security Systems
    Your price for this item is $64.99
    Save $35
    The previous price was $99.99

  8. SimpliSafe - Wireless Auxiliary Siren - White

    SKU: J3L6GWR598

    Loud alarm for SimpliSafe system....Love this alarm system for my small home. Great price. Needed an added alarm for upstairs. ...The external alarm is a great accessories for the simpli safe System by...

    Product Description

    A weatherized white wireless siren emitting a loud 105dB alarm for enhanced indoor or outdoor security.
    See all Security Camera & System Accessories
    Your price for this item is $59.99

  9. Ring - Alarm Range Extender (2nd Gen) - White

    SKU: J36CLVSCHQ

    Product Description

    A white plug-in extender that boosts connectivity between your Ring Alarm Base Station and its components.
    See all Wi-Fi Extenders
    Your price for this item is $14.99
    Save $10
    The previous price was $24.99

  10. Viper - 1-Way Security System with Keyless Entry (Remote Start Not Included) - Installation Included

    SKU: J7GGXLVGCH

    Product Description

    A comprehensive car security system featuring a 6-tone siren, shock sensor, keyless entry, and installation included.
    See all Remote Start & Security Systems
    Your price for this item is $229.99
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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.