Card reader function: can read the data in sd / tf card directly on your device.
2 usb 3.0 ports: high performance digital chip, faster transmission, support hot-swap, plug and play. Transmission speed of up to 5gbps (in theory).
Can be connected with keyboard, mouse, u disk, camera, printer or other external usb devices, support connecting 2 of them simultaneously.
Perfect for latest macbook pro. Provide extra usb ports, memory card slots and thunderbolt port for your macbook pro