The lenovo thinkpad usb 3.0 pro dock connects to your system via an included usb 3.0 cable to provide you with two video & five usb ports as well as audio & networking capabilities. This dock comes with a dvi-i port & a displayport to support up to two displays. For compatibility with legacy monitors, lenovo has included a dvi-i to vga adapter. To access your printers, scanners, external drives quickly, the usb 3.0 pro dock sports three usb 3.0 ports & two usb 2.0 ports. Accessing the network can be accomplished with the integrated gigabit ethernet jack. Furthermore, the dock draws power from the included 45w power adapter & comes with one always-on usb 3.0 port for charging battery-powered devices.