Featuring Servo Wave Action brake technology the Shimano Dura-Ace ST-R9271 brake lever delivers modulation and control like never before. Wireless shifting keeps your bike looking clean while offering the fastest most precise gear changes available. All of this resides in a dual control lever that employs the most advanced materials to offer lightweight and refined ergonomics that provide comfort and control for the most demanding conditions.The wireless connection provides a clean cockpit enhancing the aesthetic of your bike while keeping shifting lightning fast1.5 to 2 years of battery life with easy-to-change CR1632 shifter batteriesUnparalleled ergonomics engineering refined with pro rider feedbackRaised hood peak improves ergonomics while a longer hood body increases hand supportCompatible with satellite shiftersServo-Wave technology optimizes brake controlLighter smoother lever action and enhanced modulation thanks to an expanded braking control areaCarbon fiber brake lever and titanium hardwareSupports wireless connection only