1、Files can be transferred and backed up via 2 USB 0 ports, the transfer speed is fast, and the speed is up to 5Gbps. 2、Can be extended to USB devices such as U disk, hard disk, mouse, keyboard and so on through the USB port. 3、The screen can be mirrored or expanded in various resolutions through the High‑Definition Multimedia Interface port, including 4K. 4、Plug and play, easy to operate, only need to connect to the interface in the computer, no driver is required. 5、Made of high‑quality materials, and the expansion dock is strong, durable and has a long service life. 1 x Expansion Dock Item Type: Expansion DockModel: 305AInterface: Dual Type-CColor: BlackMaterial: ABS, Electronic Components, Aluminum AlloyNumber of Interfaces: 6Function: for Microsoft Notebook 6 In 1 Card ReaderApplicable Equipment: for Microsoft Notebook