Question about Ubiquiti UVC-G4-Pro

You can use one of these PoE injectors.
Value Gigabit 802.3at, 30W (PoE Injector)
Ubiquiti Instant IEEE 802.3af GE Adapter (PoE Injector)
Another 802.3af or 802.3at model would also work. :-)
If you don't have one yet, you just need an RJ45 cable.