Everything about Enhanced mini-USB
Type of hybrid electrical connector
An enhanced mini-USB (EMU) connector is a type of hybrid electrical connector which carries Universal Serial Bus data and power as well as other connections such as bidirectional audio. It was invented for and is mainly used on mobile phones. Motorola, HTC Corporation, and other mobile phone manufacturers use EMU connectors. There is more than one standard for EMU connectors, which are incompatible between manufacturers, but all are physically and electrically compatible with standard mini-USB connectors. The EMU connector has five pins for USB on one side. While regular USB connectors are empty on the other side, EMU has more pins intended for headsets. In HTC's version, two pins are for the microphone, three are for stereo sound, and one is for the push-to-talk switch. Wikipedia →
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