It comes with an external USB-A, an internal USB-A and a new generation USB-C connectors. USB-C is reversible and so no need to worry which direction to plug in.<br><br>USB-C is also better than USB-A that it increases the current from 900mA to 3A. More devices will be supported in bus-powered mode and charging will be much faster. For new MacBook and the new Chromebook Pixel user, your USB-C accessories will also work in your PC.