The ZRS-56 is a steering wheel-mounted audio control unit produced by the car multimedia company Carmedia. The unit is designed to give a driver access to all their audio functions without needing to take their hands off the steering wheel. It provides a variety of control panels, buttons and dials, which allow users to make adjustments to their audio settings quickly and accurately. Some of the features the ZRS-56 offers include the ability to control the volume of different audio sources, choose from multiple EQ presets, answer and make calls, and access a variety of audio sources including FM, DAB, Aux, Bluetooth and more. With the optional rotary encoder, users can make fine adjustments to their audio settings with a simple twist of the knob.