Harman Becker Automotive Systems manufactures the MMI system, utilizing QNX Neutrino's Real Time Operating System (RTOS) software. MMI uses Media Oriented Systems Transport (MOST) technology to interconnect the various systems. The MMI screen is available as a five-inch monochrome black-and-red or seven-inch full colour display, depending on the variation of MMI fitted in the car. Depending on the MMI generation and configuration, four to eight function buttons surround the control dial which are used to launch the various features.

Starting with MMI 3G system an integrated joystick in the main control dial can be used to (for example) navigate the map. This dial can be rotated, to navigate up and down through menus, and pressed to activate a selected highlighted function. The central element of the MMI terminal is the control dial. The system consists of the MMI terminal and the MMI display screen. MMI consists of a single integrated interface, which controls a variety of devices and functions of the car. Production MMI was introduced in the second generation Audi A8 D3 in late 2002 and implemented in majority of its latest series of automobiles. The Multi Media Interface ( MMI) system is an in-car user interface media system developed by Audi, and was launched at the 2001 Frankfurt Motor Show on the Audi Avantissimo concept car.

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