From my point of view, the USB-C variant is a bit of a tinkering solution. Basically, it is the same headphones that are charged via MicroUSB. However, the USB-C variant comes with a USB-C dongle instead of the USB-A dongle. If I understand correctly, they also supply the normal USB-A to MicroUSB cable, but also provide an adapter from USB-A to USB-C so that charging can take place via USB-C. Not a real USB-C product...