Shimano's Di2 shifting system has features "satellite shifters" that are used in conjunction with the Di2 Dual Control levers to offer fast access shift actuation from alternate hand positions on a road-type drop handlebar. Shimano has offered two optional satellite shifters, one for climbing from the top of the bars, and one for sprinting from the drops. The RS801-T Shift Switch Set has been designed for 12-speed Di2 use on the tops, otherwise considered the "Climber's" shifter.

The ultra-light composite shifter has been redesigned for even more responsive shifting action, and a better set-up when bars are taped. These are only compatible with 12-speed Dual Control levers that have the SD300 ports built into the body. The wire is integrated into the satellite shifter, and plugs easily into the Dual Control lever. There is no power, just a signal. The 12-speed Dual Control levers are designed as wireless shifters, so the signal sent via the satellite shifter is then wirelessly sent to back to create the shift actuation and it is incredibly fast. The set is sold in pairs, but you have the option use only one. The buttons themselves can be used with the detachable holder, or attached to the bar otherwise.

Note: Please recognize that Shimano sells the Sprinter version of the satellite shifters under the SW-RS801-S designation.