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Expand your Ring Alarm system to secure each door and window in your home, and hear chirps as soon as they open. Ring Alarm Contact Sensors mount to any door or window frame in your home for easy, DIY installation. Connect them to your Ring Alarm and receive mobile alerts from the Ring App so you’ll always be the first to know when something’s ajar. Ring Protect subscription required, sold separately.* 

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Review Summary

Rating 4.8 out of 5 stars with 1078 reviews

Rating by feature

  • Rating 4.7 out of 5 stars

  • Rating 4.8 out of 5 stars

  • Rating 4.8 out of 5 stars

98%would recommend to a friend

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The vast majority of our reviews come from verified purchases. Reviews from customers may include My Best Buy members, employees, and Tech Insider Network members (as tagged). Select reviewers may receive discounted products, promotional considerations or entries into drawings for honest, helpful reviews.

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

    Model:4SD2SZ-0EN0
    SKU:6403968
    Your price for this item is $39.99
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    $10.00

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    Protect your smart home product

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