If it is the same micro USB port that has been used previously and is on many android phones then it is only USB 2. The wider micro USB port with the notch that you speak of is a USB 3 port, however there is a smaller port called USB-C that can be used for USB 3, it is also a reversible port and is used on devices like the new MacBook, Nexus 6P, OnePlus 3, etc. USB-C is also the port that will be replacing all other USB ports going forward even the full sized ones.