The ThinkCentre Tiny I/O Expansion Box can increase more I/O ports for your Tiny system. And this compact I/O box is easy to connect, simply plug in a USB connector to your Tiny System.
It can also be mounted to Tiny L-Bracket Mounting Kit (Universal belt) (PN: 4XF0E51408) with your Tiny system by ThinkCentre Tiny VESA Mount (PN: 0B47374), provides an efficient and secure monitor mounting solution for your Tiny PC
Four USB ports
One pair of PS/2 port
One serial port