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Overview

Prevent entry through every door and window with the Ring Alarm wireless contact sensor. With easy DIY installation, the sensors attach to any frame, instantly notifying you through the Ring app whenever a door or window opens. Stay in the loop with real-time mobile alerts, so you'll always know when something is wrong.

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

Model: 4SD2SZ-0EN0
Web Code: 14582233
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Return Policy

30 days to return or exchange

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Manufacturer's Warranty

Check with the manufacturer for details or add Best Buy Protection for extra coverage.

For Quebec residents: See the Availability Guarantee disclosure in the Specifications section below.

What's included:

  • Ring Alarm Contact Sensor

Effective contact detection

  • Includes two pieces in a kit
  • Wireless contact sensor designed to secure each door and window in your home
  • Receive alerts on your phone and tablet when doors or windows are opened

Enhanced connectivity

  • Uses Wi-Fi for connectivity
  • Works with Google Assistant (limited functionality)

Extremely practical

  • Attaches to door and window frames
  • Allows you to monitor your home from any iOS or Android device
  • Can be easily installed without requiring any tools
  • Includes two 3V CR2032 batteries
  • Requires Ring Alarm or Ring Alarm Pro, sold separately

Other feature

  • Gain access to 24/7 emergency police, fire, and medical response when sensors are triggered (requires a Ring Home Standard or Premium subscription, both sold separately; additional licenses and fees may apply) and the addition of Alarm Professional Monitoring* to your plan
* Service available in Canada (excluding Quebec)
Product Condition
Brand New
Kit Size
2-piece kit
Control Type
Contact Sensor
Alarm/Sensor Type
Contact
Motion Sensors
No
Door/Window Sensor
Yes
Water Sensor
No
Temperature Sensor
No
Smoke/CO2 Sensor
No
Personal Safety Alert
No
Operating environment
Indoor

Compatibility

Works with Amazon Alexa
Yes
Works with Google Assistant
Yes
Works with Apple HomeKit
No
Works with Cortana
No
Works with Matter
No
IFTTT
Yes
Device Compatibility
iOS 9.3 and above; Android 5.0 and up

Controls

Apps
Ring App
Control Panel Included
No
Connectivity
Wi-Fi; Works with Google Assistant (Limited functionality)
Wi-Fi
Yes
Bluetooth
No
Thread Support
No
Zigbee Support
No
Hub/Bridge Required
Yes

Power

Power Source
100 - 240V 50/60Hz AC Adapter (Included)
Battery Type
CR2032

Alarm

Siren Included
No
Two Way Communication
No
Colour
White

Dimension

Width
5.3 cm
Depth
3.96 cm
Height
1.39 cm
Width (Inches)
2.09 in
Height (Inches)
0.55 in
Depth (Inches)
1.56 in
Weight
0.04 kg

For Quebec residents – Disclosure under the Consumer Protection Act

In compliance with Bill 29, Best Buy and third-party sellers on Best Buy Marketplace do not guarantee the availability of replacement parts, repair services, or maintenance information for any products. Coverage provided through any Best Buy Protection programs and applicable manufacturer warranties, if any, remain in place. Information about the manufacturer’s availability guarantee can be found .