The OPi-M with AUX kit adds iPod control and composite audio auxiliary audio as well as handsfree calling to the factory fiber optic system in select Mercedes vehicles. 

The OPi-A with AUX kit adds iPod control and composite audio auxiliary audio, and bluetooth handsfree calling to the factory fiber optic system in select AUDI vehicles. 

Converts standard 30-pin iPod audio and video to standard composite outputs with charging. Not compatible with newer lightning IOS ports. 

The OPi-P with AUX kit adds iPod control and composite audio auxiliary audio to the factory fiber optic system in select Porsche vehicles. 

The OPi-M with AUX kit adds iPod control and composite audio auxiliary audio to the factory fiber optic system in select Mercedes vehicles. 

The OPi-A with AUX kit adds iPod control and composite audio auxiliary audio to the factory fiber optic system in select AUDI vehicles. 

The OPiP & TOOKI for Porsche kit adds aux input or iPod control and bluetooth hands free calling to the factory radio in select Porsche vehicles.