Retrofit Alarm Kit - White
Retrofit Alarm Kit - White

Retrofit Alarm Kit


Take up to 12 months to pay with no interest and no late fees. Prequalify now.

Related Products:

Have a wired alarm system? Make it smart with Ring Retrofit Alarm Kit, a wired-to-wireless bridge that conveniently connects your existing hardwired contact sensors to your Ring Alarm system.

Requires Ring Alarm Base Station. Professional installation recommended (but not required).

Please note:
  • Existing wired contact zones must be in good working order.
  • Requires Ring Alarm or Ring Alarm Pro, sold separately.
  • Ring Alarm and all Ring Alarm accessories require a subscription for digital notifications, in-app features, digital arming/disarming, and integration with other Ring, Echo, and third party products. Subscription sold separately. View for pricing and details.
  • Save up to $100 per year on home insurance with a professionally monitored Ring Alarm.3 Learn more.
  • For use in the continental U.S. (excluding American Samoa, Guam, Northern Mariana Islands, Puerto Rico, and the U.S. Virgin Islands) and Canada.


Please enter a valid number

Need help deciding? Build your system or call 833-906-1146 to speak with an Expert.

New life for old alarms.

Retrofit Alarm Kit allows you to connect your existing hardwired contact sensors to your wireless Ring Alarm system.

  • Get started with help from a professional alarm installer (recommended, but not required).
  • Wire up to 8 zones with one Retrofit Alarm Kit (Note: not for use with wired smoke or CO detectors or existing keypads).
  • Subscribe to Ring Protect, sold separately, to arm and disarm Ring Alarm from the Ring App, get real-time mobile notifications when your Alarm is triggered, and more.2
Retrofit Kit with 5-Piece Alarm Bundle

Subscribe to control it all from the Ring App.

Unlock in-app features—like arming and disarming your system from anywhere, getting mobile alerts when your Alarm is triggered, and more—when you subscribe to Ring Protect, sold separately.

Home and Away Modes.

Home and Away Modes

Activate perimeter sensors before bed or all Alarm Sensors inside when you head out, from wherever you are.

Real Time Notifications

Real-Time Notifications

Know when someone enters a room, cracks open a window or sets off the siren right on your phone.

Connected Devices.

Automate Connected Devices

Link select Ring devices like, Video Doorbells and Security Cameras, to Ring Alarm to have them react automatically when your Alarm goes off. Control them all from a single dashboard.

Arrow Icon
Arrow Icon

Ring’s most secure subscription.

For only 67¢ a day, get emergency support when you need it most with optional Alarm Professional Monitoring, backups to keep you protected during an internet outage, and so much more. Enjoy month-to-month coverage with no long-term commitments.

Mobile Device Icon
Get Alerts and Control It All In The Ring App
Arrow Icon

Receive real-time notifications when your Alarm Sensors are triggered. Plus, Arm and Disarm your Ring Alarm from your phone, and more.2

Headphones Icon
Intruder? Smoke? Help is On The Way.
Arrow Icon

Opt into Alarm Professional Monitoring3 and, if your Alarm goes off, we’ll call to request the emergency police, fire, or medical dispatch you need.

History Icon
Stay Secure Even If The Wifi Goes Out
Arrow Icon

If your home loses internet connection, Alarm Cellular Backup4 keeps your Alarm connected and able to send alarm signals.

Contract Free Icon
Savings Built In
Arrow Icon

Save $100 or more per year on home insurance with a professionally-monitored Ring Alarm.1

Ring’s most secure subscription.

Need help installing?

A trusted installer can help you get started.
Schedule your appointment today.

Tech Specs

Size and Color Arrow Icon


4.53 in. X 4.53 in. X 1.0 in. (11.51 cm. X 11.51 cm. X 2.54 cm.)

Available Colors


Features Arrow Icon


Connect up to 8 wired contact sensor zones and allow them to communicate wirelessly to the Ring Alarm Base Station.

Power and Connectivity Arrow Icon


2 X 3V Lithium 123 Batteries (included), non-rechargeable

Battery Life

5 years with 100 events per day. "Events" defined as either open/close events or the 70 minute supervisory message sent from the device to the Base Station to report that the device is online.


Z-Wave (250-foot range to Base Station)

Installation Arrow Icon


Mounts to Walls, Double-sided Tape Provided, Screw Mounting Optional (screws are not provided)

Operating Conditions

32°F to 120°F (0°C to 49°C)

Setup Requirement

Requires Ring Alarm or Alarm Pro (sold separately)

Frequently Asked Questions

Who is the Ring Retrofit Alarm Kit recommended for?

Arrow Icon

The Retrofit Alarm Kit is recommended for neighbors who want to connect working wired contact sensor zones from a conventional wired alarm system to their Ring Alarm. The existing wired alarm panel does not need to be actively monitored or in use, but the wired zones do need to be operational with no damage. (Please check whether your existing alarm system and its sensors are subject to any contractual obligations, including early termination fees or warranties.)

How do I know if the Retrofit Alarm Kit will work in my home?

Arrow Icon

If your home has existing wired contact sensors from a previously installed alarm system, you may be able to use the Retrofit Alarm Kit. We recommend that you do a visual inspection of the sensors and wiring around your home, and consult a licensed electrician or professional alarm installer to help you inspect and test the wiring. This will ensure that the existing contact sensor zones are complete, closed circuits.

What are wired contact sensor zones? How do they differ from the wireless contact sensors that come with my Ring Alarm?

Arrow Icon

Conventional alarm systems often wire together multiple window and door contact sensors in one area of the home into a single zone, like a string of holiday lights. When any individual wired contact sensor within the zone is opened, the entire zone is considered to be open, and if the system is armed, it will trigger the alarm. Wireless contact sensors work independently, and if one sensor is opened, it will not trigger any other nearby sensors.

Note: You can wire up to 8 zones with one Retrofit Alarm Kit. If you have more than 8 zones, you can add additional Retrofit Alarm Kit devices to the same Ring Alarm.

What types of wired sensors work with Retrofit Alarm Kit?

Arrow Icon

The Retrofit Alarm Kit can monitor wired contact sensor zones (contact sensors are usually used for doors and windows).

You can also visit to learn how other wired security devices can be connected to the Retrofit Alarm Kit.

If you have wired indoor and outdoor sirens, wired smoke or CO detectors, wired keypads or other security devices, they are not supported and should not be added to the Retrofit Alarm Kit.

Do my wired sensors work the same as my Ring Alarm Contact Sensors?

Arrow Icon

Not exactly. Wired contact sensor zones may contain multiple contact sensors. When you add the Retrofit Alarm Kit with your wired zones to your Ring Alarm, the entire zone will be managed similar to individual Ring Alarm Contact Sensors, but you won’t be able to identify exactly which wired contact sensor was triggered.

But like Alarm Contact Sensors, you can set Entry and Exit delays for entire zones, bypass a whole zone for temporary access while armed, and use zones to secure your home when armed.

Does this replace my Ring Alarm?

Arrow Icon

No. You need to have a Ring Alarm Base Station set up at your home and online in order to add and use the Retrofit Alarm Kit.

Can I have professional monitoring with the Retrofit Alarm Kit? Do I need to get a new alarm permit?

Arrow Icon

Yes, if you have a Ring Protect Pro subscription, you can sign up for professional monitoring3 and monitor your wired contact sensor zones when you add them using the Retrofit Alarm Kit. Please note: Smoke and carbon monoxide monitoring is not available at a business or commercially zoned address. Learn more here.

If you live in a jurisdiction that requires an alarm permit, then the permit you already have for your Ring Alarm will cover the Retrofit Alarm Kit. If you are switching from another alarm company to Ring Alarm, you may need to update your permit or get a new permit, depending on your jurisdiction. Please check with local ordinances for more information.

I haven’t done an electrical wiring project before. Can I install this myself?

Arrow Icon

Installing the Ring Retrofit Alarm Kit is an advanced DIY project. We recommend that you consult a professional before installing the Retrofit Alarm Kit. Professional alarm installers and licensed electricians are experienced with wiring projects, are familiar with using tools such as multimeters to test electrical wiring, and can read and interpret electrical schematics. You should not attempt to install this yourself if you are inexperienced in any of these areas.

What tools do I need to for installation?

Arrow Icon

As with any project, you’ll need to have some supplies on hand. Every Ring Retrofit Alarm Kit installation will require a screwdriver that fits the existing wired alarm panel terminals and a continuity tester or multimeter. You may also need a wire stripping tool, extra 20 or 22 gauge wire, wire nuts or wire connectors, and a cleaning cloth and alcohol to clean the wall before installing using the provided mounting tape. If you would prefer to screw the Retrofit Alarm Kit into your wall, you’ll need to two screws and anchors for your wall and a drill bit.

What do I do if my wired contact sensor or zone doesn’t work?

Arrow Icon

During the installation process, we’ll walk you through a quick integrity test to identify if a wired contact sensor or zone will work with the Retrofit Alarm Kit. If it fails the test, it cannot be used with your Retrofit Alarm Kit. We suggest contacting a professional alarm installer to help you repair or replace any damaged sensors, which can be purchased at If you cannot repair a wired sensor, wireless Ring Alarm Contact Sensors can be used to secure the doors and windows in that zone instead.

Still Have Questions?

1Actual savings vary depending on insurance carrier and policy.

2Ring Alarm and all Ring Alarm accessories require a subscription for digital notifications, in-app features, digital arming/disarming, and integration with other Ring, Echo, and third party products. Subscription sold separately. View for pricing and details.

3A compatible Ring Protect subscription is required to enroll in the Ring Alarm professional monitoring service. Professional monitoring service is available only within the U.S. (all 50 states, but not U.S. territories) and in Canada (excluding Quebec). Ring does not own its own professional monitoring center. Smoke and carbon monoxide monitoring is not available for a business or commercially zoned address. See Ring Alarm licenses at:

4A compatible Ring Protect subscription required, sold separately. Alarm Cellular Backup uses a third-party carrier. Coverage will vary.

Your Cart ()

Your cart is empty.

Added to cart

Your Cart

Close Icon

Your Cart

Close Icon
Empty cart icon
Your cart is empty
Explore the latest deals and offers.
Close Icon

Arrow Up Icon