Feature: Small and beautiful appearance Compatible for Surface Pro 6 or Pro 5 or Pro 4. Color: Black Material: Aluminum Alloy Specification: USB interface compatible: USB 3.0 or 2.0 or 1.0 Memory card support: Secure Digital or Secure DigitalHC or Secure DigitalXC or TF HDMI -compatible: 4K 30Hz Compatible system: for Windows XP or 7 or 8 or 10, for MAC OS 9X or 10 Voltage: 5V 9V 14.5V 20.3V Input: USB 3.0 male, Mini DP male Output: USB 3.0 x 2, HDMI -compatible x 1, Secure Digital or TF x 1 Product size: 91.5 x 32 x 11.5mm or 3.60 x 1.26 x 0.45 inch Package Contents: 1 X USB Hub Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is 1-3cm.