I used this along with
35 OHM 50 W 1% POWER RESISTOR VISHAY/DALE RH50-9735 SOLDER TERMINALS,
I found if you clip off yellow wire nut next to the open cone. You can thread this on and make a great wire connection on each end just hook one wire to Resister and other end with a short piece of wire to one screw of the transformer, now connect the other free wire that is a pair of wires running to the Ring Doorbell to the other screw of the Transformer. Now take the 3 wires and connect it to a 3 prong plug in, or you can hard wire it to an electrical outlet.
That is it.
Your Ring Doorbell is ready to be use and never to take off and charge again