Most comfortable pair of running shoes I’ve ever owned! It is usb-c to usb-c. Using on an iphone 11 pro max. Product was a bday gift and when the item was opened one shoe was completely ruined. Really really love these boots. If you need orthotics or any kind of real foot support but miss wearing flip flops all the time, these are a life saver. If you need a bag for a tennis racquet or two, this is a great product. The build is rock solid feeling. I ended up giving them away. Wish they had more colors