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Left side ports
Lenovo has included a number of ports on the T431s in spite of the thin casing.
Power, RJ-45 (ethernet), VGA, USB 3.0, SD card slot, audio in/out jack, optional Smart card slot
Right side ports
Fan louvers, miniDisplayport, USB 3.0 (powered)
Trackpad and Trackpoint stick
ThinkPads are famous for the red Trackpoint stick and the T431s has one embedded in the keyboard. The expected three buttons to use with the Trackpoint are missing as the trackpad steps in to fill those functions (detailed on next slide).
The oversized trackpad has a glass surface making it very easy to slide the finger to control the cursor. The trackpad can be used for gesture control of Windows 8.
There is a small fingerprint reader on the lower right of the keyboard for user authentication.