This challenge guide points out how you can replace a wired doorbell with a wireless system and the way to replace a transmitter, chime device and transformer for just a wired doorbell 2Sold individually. A compatible smart lock have to be create in the Ring App to allow this performance. https://directmysocial.com/story134728/the-5-second-trick-for-how-to-replace-blink-doorbell-battery