G4 Pro vs G4 Doorbell Size comparison : r/Ubiquiti
UniFi Protect - G4 Doorbell Wiring Diagrams – Ubiquiti Support and Help Center
DEWENWILS Doorbell Ring Transformer, 16V 30VA Low Voltage Transformers Compatible with Ring Video Doorbell Pro, Nest Hello Doorbell, UniFi G4 Doorbell, Power Multiple Door Chimes, Hardwired - - Amazon.com