Flight Deck is a system of Shimano components with integrated bicycle computer which besides the usual things like speed, distance and time, also indicates the selected gear and the number of meters per rotation staircase.
The Flight Deck is a wireless and standard construction.
Operation is through buttons on the inside of the Dual Control brake / shifters.
This counter has processed buttons in the steering wheel, giving you speed and distance traveled.
But also the gear you are running and the calculated cadence is displayed.