An extended Universal-Serial-
Bus (
USB) connector plug and socket each have a pin substrate with one surface that supports the four
metal contact pins for the standard
USB interface. An extension of the pin substrate carries another 8 extension
metal contact pins that mate when both the connector plug and socket are extended. The extension can be an increased length of the plug's and socket's pin substrate or a reverse side of the substrate. Standard
USB connectors do not make contact with the extension
metal contacts that are recessed, retracted by a mechanical switch, or on the extension of the socket's pin substrate that a standard USB connector cannot reach. Standard USB sockets do not make contact with the extension metal contacts because the extended connector's extension contacts are recessed, or on the extension of the
connector pin substrate that does not fit inside a standard USB socket.