Connect up to 3 additional monitors. I used this for a few weeks and changed my office. Your laptop is no longer constrained by its included ports. With a single cable, the Dell Docking Station - USB 3.0 connects your laptop to various devices, such as printers, scanners and external hard drives. There's also a Gigabit Ethernet port, headphone jack and audio output to connect external speakers. Advanced networking and security for enterprise use The Dell Docking Station - USB 3.0 connects your laptop to up to three additional monitors, various external devices and the Internet with a single cable. It features a convenient way to expand the capabilities of your portable PC and customize your desktop computing environment. This sleek, compact dock unlocks enhanced productivity and entertainment options with highspeed connectivity and support for Ultra HD 4K displays. It also includes three USB 3.0 ports, as well as two USB 2.0 connections, ensuring compatibility with a vast array of peripherals, such as external hard drives, printers and scanners. Moreover, it is a great choice for corporate environments with Wake-On-LAN and PXE boot (on selected platforms).