Shimano Dura Ace SW-9071 Shifter Switch

No need for time triallists and triathletes to choose a shifter position - with Di2 multiple shift controls are possible. Multiple control positions means shifts are always close at hand. Di2 technology shifting is easy and precise - just a light touch, as soft as a mouse click, is sufficient for the front or rear derailleur to instantaneously select the correct gear.
SW-9071 delivers fast, accurate and effortless shifts betweeen the gears. 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.