The Bytecc enclosure does have an external 5v power supply connector.
That said, read the specifications on Newegg’s page. The unit will draw power from the USB port, provided the disk doesn’t exceed 5v @ 1amp.
It’s likely that the USB cable has two connectors for the PC, as the USB specification provides only 500 milliamps (.5 amp) from the port.
I have several 2.5” USB enclosures that draw their power from one or two USB ports (depending on the requirements to spin up the drive). All have a 5v power supply connector.
Jef