Shimano Dura Ace Di2 SW-R9150 Electronic Shifter Black Discover the precision and speed of shifting with the revolutionary Shimano Dura Ace Di2 SW-R9150 electronic shift knob. Designed for demanding cyclists looking to improve their performance with each pedal stroke. Compatibility with 11-speed/double shifting systems. Advanced wireless connectivity for custom configuration. Long-lasting battery type and easy recharge. Water resistance to perform in all conditions. Light weight about 43g (pair). Ergonomics and optimized design for intuitive handling. E-Tube connectivity technologies for customization.