's Ultegra ST-R8170 brake levers bring enhanced modulation and control to every ride by employing 's proven SERVO-WAVE technology. The Di2 platform untethers the shifters while delivering fast and reliable wireless shifting. Your time on the bike is precious, let make it even better.Features-The wireless connection provides a clean cockpit, enhancing the aerodynamic effect and easy maintenance-Unparalleled ergonomics engineering refined with feedback from professional riders-Raised hood peak improves ergonomics-Brake control is optimized with light and smooth lever action-Enhanced modulation thanks to an expanded braking control area-Compatible with wireless or wired connection-High electronic energy efficiency, with 1.5 to 2 years of battery life from CR1632 shifter batteries-Can be used with additional satellite shiftersItem Specifications-Brake Lever Actuation:Hydraulic-Brake Lever Use:Left-Color:Black-Defined Color:Black-Drivetrain Speeds:12-Front Der/Shifter Compatibility: Road Di2-Hydraulic Fluid Type:Mineral Oil-Rotor Included:No