The expansion dock is plug and play, which is convenient to use. Simultaneous use of three ports is supported by it.The USB2.0 technology and thickened interface allows for anti-interference, quick and stable signal transmission.Made of ABS material, the expansion dock is stainless and lightweight to use.The length of the item is 55mm, width is 30mm and height is 19mm, so it is convenient to carry it with you due to its compact and mini size.The expansion dock is suitable for being used in laptop, keyboard, card reader and so on.Item Name: Expansion DockMaterial: ABSColor: Black, WhiteInterface Type: 3 x USB2.0Transmission Speed: 480MbpsDownward Compatibility: USB1.0, USB1.1Features: Fast Transmission, Stable Output, CompactSize Details: 5.5cm x 3cm x 1.9cm/2.17" x 1.18" x 0.75" (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(Others Not Included)