Connect your smartphone with a music player and charge at the same time with the Belkin Rockstar Usb C to usb C and 3.5mm Cable Converter. This converter has a usb C connector for your smartphone or tablet on one side. On the other hand there are both a usb C port and a 3.5 mm connection. You connect a USB C cable (charging) and a 3.5 mm audio cable (music) to this at the same time. For example, you can listen to music on the road via the music player of your car and your phone is fully charged when you arrive. Now that more and more smartphones no longer have a 3.5 mm connection, this is the most convenient way to connect your device wired to a speaker. Note: USB C / 3.5mm cables are not included. This is only the converter that serves as an intermediary between the cables and your smartphone or tablet.