Shimano SW-R600 Di2 Remote Climbing ShiftersUnit is designed to be mounted on the right-side top section of a drop bar adjacent to the stem Proper placement allows the rider to shift the rear derailleur up or down with the right thumb while in a climbing position All Di2 components on the bicycle require the same firmware version. Using Di2 components with different firmware versions may cause malfunctions Use Di2 system checker to update component firmware from http://e-tubeproject.shimano.com/
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