It is easy and convenient to use this expansion dock because it is plug and play. This expansion dock supports interface extension and bring you more convenience. Featured with powerful chip, this expansion dock supports high-speed and stable data transmission and read and write function. It is constructed of aluminum alloy material. The length of this product is 2cm and width is 1cm. This expansion dock is compatible for laptop, keyboard, mouse, U disk, printer, mobile hard disk and so on. Item Name: Docking Station Material: Aluminum Alloy Style: A/B: Braided Cable, C/D: PVC Cable Interface: USB3.0 Ports: 3 x USB2.0, 1 x USB3.0 Features: Multifunctional, Fast Transmission, Lightweight Size Details: L: 2cm/0.79", W: 1cm/0.39"(Approx.) Cable Length: 20cm/7.87" (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 Docking Station