The UG MB ACC (Amplifier Connection Cable) is needed for easy installation of an aftermarket amplifier in the rear area (side panel/spare wheel well). It allows easy audio signal tap (Hi-Level) in front of the original (OEM) amplifier. all necessary signals are taken (Front/Rear/Center/Sub). The cable is made of high quality, twisted, fine stranded copper wires with the exact fitting connectors and open, pre-insulated cable ends. This makes it easy to install the ETON STEALTH 7.1 DSP high-level connector plugs, for example. Please note the already predefined connection plans and presets for your Mercedes-Benz model (Service / Downloads).