I installed a Ring Pro yesterday in my home. No existing door bell but I ran dual Cat 6 to the front door. I used a 16v ac (40 va) power supply that I already had with one of those Cat 6 wires. Everything works fine.

But how can you get a contact trigger from the Ring Pro being activated or button push? There are only 2 contact points on the back for power. Please explain. Ring doesn't have any documentation in the box or on their web site and their support dept doesn't condone any 3rd party integration. I don't even get how a Ring button push would trigger an existing door chime