StarTech ICUSB23216F 16-Port FTDI USB B to RS232 Serial Multiplexer COM Adapter 
Good used condition, power on tested and shows up in windows, we use the same one for a testing rack for other equipment, they are pretty handy.  Does not include power supply, includes USB A-B as pictured.

Units were 400$ when new.

Info page for this unit: startech.com/en-eu/cards-adapters/icusb23216f?srsltid=AfmBOop5ppQOhoDYtefFuIIPLT3q3fjmBkYjOmz_m4DjzDRAkwlI8gI5#tech--certifications

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