Description
Power on
Keep working with a power pass through that powers your device while it charges.[2]
Built for enterprise
Support network manageability of your device and the docking station with integrated Wake on LAN[3], PXE boot, and 802.1x authentication on the docking station, and get physical security from a security lock slot.[4]
Park it or pack it
Place the compact dock on your desk with minimal impact to your workspace, or take it to go with your tablet.
Rest easy
Get the reassurance of a one-year limited warranty.
Auto-sensing 10/100 ports 
The ThinkPad USB 3.0 Ultra Dock (40A8) is an universal USB docking solution that not only delivers a premium display experience (up to 4k2k resolution via DisplayPort), but also provides quick and easy connection to all the workspace peripherals you use every day. Simply plug in a single USB 3.0 cable into your Lenovo PC for instant access to up to two external monitors, USB ports, Gigabit Ethernet, headphones/speakers, USB printers, scanners, keyboard, mouse and so on for daily use. The Dock can also charge your mobile devices via two USB always power on ports. 
Dell Express Charge allows you to charge up to 80% in one hour