My 2017 B250e doesn't have the 3.5mm aux-in port. I used this with an XM radio on my previous 2014 B-class, and I would like to find a solution to connect this. The 2017 has a USB connection for USB drives, but I don't think there's a good way to use those. Bluetooth is another way, so I tried an Aluratek Bluetooth transceiver, but I couldn't get it to pair properly. The XM radio can also transmit FM, but I suspect the sound quality won't be great with that.