Mercedes E class, CL & SLK Audio 20 NTG1 Quadlock cable to be used in conjunction with an ISO Mute harness normally supplied with the hands-free car kit.

(This quadlock is wired differently from other Mercedes quadlocks)

This cable fits behind the car radio and is used as a break-out cable to enable the audio of the hands-free kit to play through the cars speakers.

Use with Parrot  or any other kit that has an ISO mute cable.