If you have the NTG1 Audio 20 APS/NTG2.5 Comand APS/NTG2.5 Audio 20/50 APS/MCS-II as shown in above photo WITH external Harmon/Kardon fiber optic audio system in your Mercedes-Benz then this aftermarket head unit will be a direct plug-and-play replacement using the short wiring adapter lead provided. NOTE If you have the NTG1 Audio 20 APS/NTG2.5 Comand APS/NTG2.5 Audio 20/50 APS/MCS-II as shown in above photo WITHOUT external Harmon/Kardon fiber optic audio system in your Mercedes-Benz then this aftermarket head unit will be a direct plug-and-play replacement using the short wiring adapter lead provided. Note that only four car speakers work after install this kit. Check more info about the Extension cord for Mercedes-Benz aftermarket head unit. The extension kit is optional, please add it from the drop-box. Installations requiring the extension are more time consuming than for cars that do not require it, however it is still relatively straight forward. This means that to integrate this aftermarket unit with the car you must run an extension kit to the speaker/power wires in the rear. The majority of cables such as speaker wires, power wires and the radio antenna are found in the rear of the car at the original amplifier. Head units which are run by MOST will have a pair of orange plastic fiber-optic cables on the rear and no speaker outputs. NOTE If you have any of the above 2 head units (NTG1 Comand APS or NTG1 Audio 50 APS) then your speaker system will be powered by a fiber optic (MOST) amplifier in the rear of the vehicle. Mercedes-Benz CLK/CLS has two similar head units, but the size are not the same.Please measure the dimensions of original radio as shown below, this product is only suitable with the one with 253mm*238mm*120.15mm. After install this new unit, you will get an intelligent entertainment system with Touchscreen/Navigation/FM/AM/ USB/SD/ WiFi/AUX-IN/Bluetooth phone call/Bluetooth music/ DVD playback /DAB+( device is optional)/rear view camera (device is optional)/Apple CarPlay(device is optional)/TV(device is optional)/OBD( device is optional)/Google Play etc. It has the same harness and plug as original radio, totally plug and play when install. This aftermarket Navigation DVD Player is specially designed to upgrade Mercedes-Benz CLK-Class( C209/W209)/CLS -Class(W219) OEM basic radio system or OEM navigation head unit.

Comand aps ntg1 software update