This is a used Ring Doorbell Pro that is hardwired to your existing two wire doorbell. It works fine. I had no problems with it at all. To the best of my knowlege all of the original parts and documentation are in the box along with the doorbell itself as shown in the pictures. The doorbell and camera are in excellent condition as it was installed under an overhang and not subject to harsh weather or sun. I am selling this because I replaced the Ring doorbell with a completely different system and no longer need it.