Blitzsafe BMW/DSP1 is a special analog to digital converter for BMW cars with DSP (digital signal processing). For use with factory DSP (digital signal processing) radio's only. Connects to the Blitzsafe BMW interface (mLink or Aux) and digital amp located in the trunk. Works with factory "Standard" or "Business" radio, with or without navigation system. Not all DSP radios have the coaxial connection in the trunk. Some have the standard 6 pin connection and do not require this interface. ONLY FOR USE WITH DSP SYSTEMS BMW 1996-2007(except X5)