The Shimano EW-EC300 1700 Di2 Charging Cable with USB Power Cable is designed specifically for Shimano's 12-speed Di2 systems, ensuring seamless compatibility and performance. This compact and durable charging solution allows for quick and efficient power replenishment, making it an essential accessory for cyclists who rely on electronic shifting. With its included USB power cable, users can easily charge their Di2 systems on the go, ensuring optimal performance during rides.