Shimano 105 ST-R7170-L Di2 Shift/Brake Lever - Left 2x Black. The Shimano 105 ST-R7170 Di2 Shift/Brake lever features Di2 electronic shifting for precise intuitive gear changes to even more riders.Reach adjustment and customized button functions allow you to dial in your ideal ergonomicsCreates a clean cockpit with wireless connection and enhances the aesthetic of your bike while keeping shifting lightning fastEasily change button function with the E-TUBE appRaised hood peak improves ergonomics while a longer hood body increases hand supportIncludes 2 x CR1632 batteries