Cropped; flickr.com, 2008
The photo is taken in cruise. The selected display shows takeoff data. There is also a send button (which hints at a datalink capability for communicating values).
I searched for performance calculators and datalink solutions for the 757, but came up empty. Nothing matched that unit.
What are its features? Say compared to Boeing's own ACARS/AOC for datalink (via the standard CDUs).