The display adaptor has a spot to charge from so you can drive a display charge and use USB, all at the same time. http://store.apple.com/us/product/MJ1L2AM/A/

The display adaptor has a spot to charge from so you can drive a display charge and use USB, all at the same time. http://store.apple.com/us/product/MJ1L2AM/A/usb-c-vga-multiport-adapter?fnode=51 http://store.apple.com/us/product/MJ1L2AM/A/usb-c-vga-multip...