shimano dura-ace di2 sw-r9150 remote satellite shifters black, set shimano adding functionality and convenience to your shimano di2 drivetrain, the dura-ace di2 sw-r150 remote satellite shifters give you the ability to shift the rear derailleur in an upright position when you're resting and climbing. this is especially useful for preserving energy on long uphill grades where you need to shift without lowering into the drops. separate buttons give you one-click controls for up and downshifts of the rear derailleur. it connects to the e-tube drop bar sti shifters of your di2 drivetrain. the remote satellite shifters come with connector cables, mounts, and tie-downs for a clean and secure attachment.