Do you have any issues? I used to find that the T420 series were hot garbage... Trackpads that didn't always work, the nipple mouse never worked, keyboard keys being soft stickied and no external hdmi.
No issues so far, checked all the ports, like HDMI/USB/USB-C/MicroSD, trackpad works ok, keys are good best laptop keyboard I used, nipple mouse is annoying so I don't use it at all.