What are the USB ports capable of charging devices at? John June 22, 2018 04:47 Updated Follow The USB ports are standard 5v at 1.5A and will charge at 7.5W. Related articles Quick Guide How long is the usb cable on the hub and card reader? It looks like it does not detach.. Can this adapter be plugged into a printer to connect to a network? What is the max pass-through wattage this can pass through to the Macbook? What is the difference between the Multi-Port Adapter V1 and V2? Comments 0 comments Please sign in to leave a comment.