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 ergonomics. Creates a clean cockpit with wireless connection and enhances the aesthetic of your bike while keeping shifting lightning fast. Easily change button function with the E-TUBE app. Raised hood peak improves ergonomics, while a longer hood body increases hand support. Includes 2 x CR1632 batteries