The USB power cable allows you to operate your ps3toothfairy from any available (always on) USB port. The cable is black and 1M (3 ft) long. It has a USB-A plug on one end and a 2.1mm plug on the other end.
NOTE: The PS3 USB ports are not powered when the PS3 is turned off. So you don't want to use the USB port on the PlayStation. Instead use a USB port from your Tivo, Sat Box, etc. Just be certain that it is always on.