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About this item

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. 

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Review Summary

Rating 4.8 out of 5 stars with 1135 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

Customers are saying

Customers recognize the Alarm Contact Sensor (2nd Gen) (2-Pack) for its easy installation, reliability, and contribution to home security. Many customers appreciate the compact size and straightforward setup process, which includes seamless integration with the Ring Alarm system. These sensors provide peace of mind by promptly alerting homeowners of any activity, making them feel secure in their homes.

This summary was generated by AI based on customer reviews.

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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.

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

    Model:4SD1SZ-0EN0
    SKU:6403955
    Your price for this item is $19.99

    Number of Devices Included

    1
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