In this video it shows how you can connect a Bluetooth music streaming with USB and AUX-in adaptor to the Comand Unit via the fibre optic cable of your Merce
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AMI MMI Bluetooth Aux Adapter, Media Music Interface Audio Cable Compatible with Mercedes Benz C E A B G SLK CLS GLK SL Class 2011-14 with COMAND-APS NTG4.5, Computers & Tech, Parts
CKM Car Design - BLUETOOTH audio streaming via AUX kit