We have a very old doorbell and we’re not sure on how to install into it, please see attached photographs for reference on the doorbell itself. We don’t know how to install the jumper into the chime.
Check out our wiring diagram for the Video Doorbell Wired to see where the jumper cable is placed.
The jumper cable will connect two terminals, the transformer terminal and the terminal that operates the button at your door. If you are unsure about this installation, we advise consulting with a qualified electrician for installation. I hope this helps!