A conventional doorbell has wires that connect the chimes or bell to the power source and that run to the button, which acts as a switch.
Replace a door bell with a door chime by choosing this IQ America Multi-Voltage Wired Doorbell Transformer.
Items similar to Vintage Rittenhouse Doorbell Transformer Model C 8131 on Etsy
Run your door bell or door chimes from mains electricity by installing this affordably priced Everyday Door Bell Transformer.
Doorbell Transformer, Golf Ball, Michael O'keefe, Wiffle Ball