Review on Lenovo ThinkPad USA Ultra Dock with 90W AC Adapter (40A20090US) - Retail Packaged: Efficient Connectivity Solution for Enhanced Performance by Evan Larson

I actually bought this to support an extra (3rd) monitor. I have a T440p with Intel HD Graphics 4600 and I have seen that this dock can support 2 external 4k monitors in addition to the laptop screen. It was a little tricky to set up as the settings display in the control panel (Win10) didn't recognize the 3rd monitor. I had to go into the Intel HD Graphics Control Panel on the Multiple Displays page to enable the 3rd. Once that was done I was able to access all 3 monitors from the control panel. .There have been several reports online of not being able to use both displayports at the same time, so I'm using a displayport connection and an HDMI connection (never tested with both displayports so can't say for sure). . The displays are a bit slower, but this is only a laptop and it uses a heck of a lot of pixels. The refresh rate is only 29pHz on 4k monitors, which might not be enough for gaming, but good enough for office work.