The Shift:R, made by Cinq5, is the first thumb shifter available for the Rohloff SPEEDHUB. It replaces the Rohloff twist shifter and cable box. The shifter features separate levers for high and low gear. It can be used on drop bars or flat bars. Cable tension can be adjusted at the levers and the ratchet box. It also allows riders to use full size grips rather than shortened grips designed for twist shifters.
How to change cables: https://www.youtube.com/watch?v=2aWv6UyGTlM
View of ratchet mechanism: https://www.youtube.com/watch?v=y0TuA_RJsXE