Moving and want to deactivate Ring devices

Hello! We've sold our home in which we currently have numerous Ring devices. Some of these devices we'll take with us when we move (such as the Stick-Up Cams), but some (Spotlight Cams and Doorbell) will be left for the new owner. What is the proper procedure to deactivate the latter Ring devices in order to pass ownership and control of these to the new owner. Thank you.