It is easy and convenient to use this expansion dock because it is plug play and driver-free. This expansion dock features high resolution and high-speed transmission, which supports clear, delicate and smooth viewing experience. It is constructed of metal material. The length of the expansion dock is 21cm, width is 2.9cm and thickness is 1.2cm, so you can carry it with you conveniently. This expansion dock is suitable for being used in computer, projector, TV set, mouse, keyboard and so on. Item Name: Expansion Dock Material: Metal HDMI-compatible Output: Up to 4K/30Hz Output USB3.0: Support 5Gbps USB2.0: Support 480Mbps USB C Port: Supports Up to 5V@2A Charging Compatible System: for Mac OS, for Windows, for Android Features: Multifunctional, Fast Transmission, Lightweight Size Details: 21cm x 2.9cm x 1.2cm/8.27" x 1.14" x 0.47" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Expansion Dock