No need for time triallists and triathletes to choose a shifter position - with Di2 multiple shift controls are possible. Use Dual Control levers on the base bars and satellite controls on aero extensions. The controls work together - shift from base bars or in the aero position, instantly.
Multiple control positions mean shifts are always close at hand
Fast, accurate, effortless shifts SW-9071
single-button controls minimise movements for maximum aero efficiency
Double and single button controls on aero bar shifters