The ALOGIC (VU3UDP)USB 3.0 Universal Portable Docking Station – HDMI or VGA/Gigabit Ethernet/USB 3.0 is a compact all in one solution for connecting your computer/laptop to an external display gigabit ethernet and USB peripherals all at the same time. Its a perfect travel companion it can replace as many as three adapters/dongles to save you space on your desk and in your bag. The dock is host powered by USB port its connected to and no external power is power is required to use this dock.The ALOGIC dock lets you choose from the available VGA and HDMI ports to connect your computer/laptop to an external monitor*. The adapter lets you connect to a wired networks via an Ethernet port ensuring connectivity in virtually any environment. The included USB 3.0 Port lets you connect to a range of peripherals such as printers scanners and external hard drives.*When connected to both the HDMI and VGA monitors the docking station will automatically switch to the HDMI monitor and disable the VGA monitor.