can i use it for think pad T 540p?

Not sure... definitely works on my ThinkPad x1 Carbon. I tried plugging in a ThinkPad L450 and it did not work. I'd call Lenovo and ask them.

Does the Lenovo ThinkPad USB 3.0 Pro Dock-US 40A70045US work with Lenovo's Flex 4 laptop?

Lenovo told me this will work so I just ordered one

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Overview

Specs

Reviews (3)

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The ThinkPad USB 3.0 Pro Dock delivers a professional universal USB docking solution with fast USB 3.0 ports and digital video ports for 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, Gigabit Ethernet, headphones/speakers, USB printers, scanners, keyboard, mouse and so on for daily use. The Dock can also charge your mobile device via USB always power on port.
Dock requires included AC power to operate.

Model
Brand	Lenovo
Model	40A70045US

Details
Color	Black

Dimensions & Weight
Weight	0.52 lbs

Features
Features	Driver Update Required For Optimal Functionality Includes 45W Power Adapter (does not power or charge the laptop) Important - Full Compatibility List In Description Supports screen replication for up to two external monitors Includes DVI to VGA Adapter

Additional Information
First Listed on Newegg	September 08, 2015

Return for refund within: 30 days

Return for replacement within: 30 days