The hallmark of Shimano's Systems Engineering is a seamless integration of body and machine. This has resulted in the finest cycling technologies in the world, and has producted the most accurate, versatile, and responsive cycling computer on the road and off road. Controls integrated into shift levers. Start and alter inputs without changing hand position. Gear selection and ratios instantly available due to the sensors built right into levers. Calculates Virtual Cadence from road speed gear ratio. 9 10 Speed Compatible. New Color. Mounting Kit Sold Seperately.