Features: 1. Charging cable for Shimano Di2 electronic shifting system, designed for charging only (no data transmission). 2. Full power-off function helps prevent overcharging, protecting the battery and drivetrain components. 3. If the battery is fully discharged, activate it with the original battery first to ensure proper charging. 4. LED indicator: solid green = full charge or reversed plug; solid green + blinking red, or solid red + blinking green = charging. 5. After charging, if the electronic shifting does not respond, press and hold any shift button for 2 seconds to resume normal operation. Product Details: Specifications: - Color: Black - Material: Plastic - Package includes: 1 x Road Bike Battery Charger - Note: Color may vary slightly due to lighting and display; measurement error allowed ±1-3 cm.