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Shimano introduces the DURA-ACE Di2 satellite shifters for quick rear shifting while riding in the handlebar drops. These shifter buttons are especially designed for sprinters, to keep a firm grip on the handlebar while sprinting and shifting in the drops. These compact sprinter switches can be mounted anywhere on the handlebar and plug and play easily into the existing Dura-Ace Di2 ST-9070 levers. Left switch for up shifting and right shift for down shifting.