Hi @user53133. Yes, you should be able to use Ring Contact Sensors and Motion Detectors from a previous alarm system to add to a new one, regardless of whether they belonged to someone else's alarm system. There are a few steps to take, and they differ depending on what generation of devices they are. I recommend reaching out to our support team to help you figure out what you have and guide you through getting all of them set up with your alarm system. Give our support team a call at one of the numbers available [here](https://support.ring.com/hc/en-us/articles/213608406#callus). If you are outside of the US, please visit [here ](https://support.ring.com/hc/en-gb/articles/213608406)to see how to contact support.

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