Special USB plug having different structure from standard USB plug and USB receptacle matable with the special USB plug

摘要

A universal serial bus (USB) receptacle with which and from which a standard USB plug and a special USB plug are selectively matable and removable along a predetermined direction. The standard USB plug is in accordance with a USB standard so as to have a standard shell. The special USB plug has a special shell so as to have a different structure from the standard shell. The USB receptacle comprises a detector. The detector has a contact portion. The contact portion is arranged at a position where the standard shell does not arrive when the standard USB plug is mated with the USB receptacle. The special shell is connected to the contact portion at the position when the special USB plug is mated with the USB receptacle.