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Ring Retrofit Alarm Kit allows you to connect your existing wired contact sensor zones to your wireless Ring Alarm system and control it from the Ring app. Professionally install and connect up to 8 contact sensor zones with 1 Retrofit Alarm Kit. Receive mobile notifications when wired contact sensors on your doors and windows are opened. Arm and disarm your system with a simple tap. Even manage all your Ring video doorbells cameras and Alarm devices from 1 simple dashboard. Get even more out of all your Ring devices with Ring Protect a comprehensive service that lets you review what you missed and get 24/7 emergency services with professional monitoring. See save and share videos and photos when you activate Ring Protect Plus for 10/month per household. Register on the Ring app. Cancel anytime.