The expansion dock plug and play, so you can use it easily and conveniently. The expansion dock adopts USB3.0 standard interface, allowing for high-speed and stable transmission. Made of aluminum alloy, the expansion dock is stainless and hard to use. The length of the expansion dock is 4.78cm, width is 1.7cm and thickness is 1.6cm, so you can carry it with you conveniently. The expansion dock is suitable for being used in computer, projector, TV set and so on. Item Name: Expansion Dock Material: Aluminum Alloy Style: USB, Type-C(Optional) Cable Length: 9.5cm Current: 500mA Interface: 1 x USB3.0 Male, 1 x USB.0, 1 x USB2.0, 1 x TF Card Slot, 1 x SD-card Slot Transmission Rate: USB3.0, USB2.0: 5Gbps, TF/SD-card: 18-20MB/S Features: Multifunctional, Fast Transmission, Lightweight Size Details: Expansion Dock: 4.78cm x 1.7cm x 1.6cm/1.88" x 0.67" x 0.63" (Approx.) Cable Length: 9.5cm/3.74" (Approx.) Notes: Due to the light and the screen setting difference, the item's color may slightly differs from the pictures. Please allow slight dimension difference due to the manual measurement. Package Includes: 1 x Expansion Dock