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

MODEL:

4SD2SZ-0EN0
3.5 out of 5 Customer Rating
Ring - Alarm Contact Sensor (2nd Gen) (2-Pack) - White is rated 4.3 out of 5 by 11.
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About this Item

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

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.

Features:

Requires Ring Alarm or Ring Alarm Pro, sold separately.

Get alerts on your phone and tablet when doors or windows are opened.

Monitor your home from any iOS or Android device.

Easy installation with no tools required

Includes two 3V CR2032 batteries

Mounts to door and window frames

Get 24/7 emergency police, fire, and medical response when sensors are triggered when you subscribe to Ring Home Standard or Premium, sold separately, and add Alarm Professional Monitoring* to your Plan.

*Professional Monitoring is an add-on plan that first requires a compatible Ring Home subscription. Both sold separately. Service available within the U.S. (all 50 states, but not U.S. territories) and in Canada (excluding Quebec). Ring does not own its monitoring center. Smoke and carbon monoxide monitoring is not available for business or commercially zoned addresses. See Ring Alarm licenses at: ring.com/licenses. Additional fees may be required for permits, false alarms, or Alarm Verified Guard Response, depending on your local jurisdiction.

Number Of Sensors Included
2 Sensors Included
Power Source
Battery Powered
Network Connectivity
Z-Wave
Connectivity
Wireless
Environmental
Indoor
Operating System Compatibility
Android, Apple iOS, MAC, Windows
Additional Features
Ring - Alarm Contact Sensor (2nd Gen) (2-Pack) - White Upgrade your home's security with this two-pack of Ring Alarm contact sensors. Compatible with the Ring app, these sensors send a convenient push notification whenever the threshold is crossed so you can easily keep an eye on your home. These Ring Alarm contact sensors require no tools for effortless installation in window frames or door jams.
Shipping Weight
1 lb
Rated 5 out of 5 by from Ring Alarm Window and Door Sensor, yes please! Ring Alarm Window and Door Contact Sensor is highly functional with compatibility performance, perfect size, easy set up. Perfect for home and office. Highly recommended!
Date published: 2026-03-24
Rated 5 out of 5 by from These are wonderful to add to your home. This ring door way and window sensor is great especially if you have children that try to open the door. It connects easy, the alerts are loud and clear but not obnoxious, the material is perfect.
Date published: 2026-03-21
Rated 5 out of 5 by from Great brand Best security brand ive used for my home. Installation was simple. Size fit perfect and gave the right angle. Design looks innovative and the app for notifications works smoothly.
Date published: 2026-03-10
Rated 5 out of 5 by from Great sensors for entry points These work great with the main ring alarm base station. They’re very responsive and I like the sounds as it’s not overstimulating but still helpful. I have had these for around a year and have yet to have any issues (fingers crossed). I also love how easy they are to install and get up and running on the app. It’s also great to be able to buy more as needed at any time.
Date published: 2026-03-09
Rated 5 out of 5 by from Easy As always easy setup and it just works. Have had no issues. Ring security systems have all the features you want and need. They are designed small and compact so they don't get in the way.
Date published: 2026-03-09
Rated 5 out of 5 by from Detects door and window openings, sends alerts to Ring 2-Pack Window & Door Sensors detect when doors or windows open, send alerts to Ring app, and work with Ring Alarm system for home security Detects door and window openings, sends alerts to the Ring app, and integrates with the Ring Alarm system.
Date published: 2025-12-18
Rated 5 out of 5 by from Very simple and very effective I bought this as a kit came with everything I needed to put security system in my house it also sinks up to any Ring cameras you have or any other ring products really nice system
Date published: 2022-12-19
Rated 3 out of 5 by from One of sensor quit working in 2 years. Tried to reset the malfunction sensor but not successful. It only works for less than a day after reset. Rest sensors worked fine and lasted more than 4 years.
Date published: 2022-12-20
Rated 2 out of 5 by from Not my favorite, had better luck with other brands I really don’t care for the contact sensors. With the cold and heat, they tend to unglue and fall off causing false alarms. I wish they made a better system for this
Date published: 2026-03-18
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