Nogis Micro USB Hub 3.0 SD SDHC Card Reader 4-Port 4-In-1 Bus Powered Hub Adapter Cable Concentrator for Microsoft Surface pro, pro 2, pro 3 tablet Works exclusively with Surface Pro/Pro 2/Pro 3 tablets Simply plug the USB Hub 4 in 1 into your Microsoft Surface Pro, Pro 2 Pro 3, then you can connect a keyboard, a mouse, a printer, an external HDD, etc. USB Hub 4 in 1, 2 USB 2.0 Ports and 1 Micro SD, 1 SDHC/MMC card slot. Works with surface pro3 without locking the charging port. Convenient for business users and travellers.