Port: Type-C Compatible with 12-Speed Di2 Groupsets: R9200, Ultegra R8100, 105 R7100 Emergency Power Supply: Use any Type-C power source (e.g., phone charger, portable battery) to charge your Di2 electronic shifting system during rides, ensuring uninterrupted performance Compact & Portable: Ultra-small design for easy storage in bike bags or pockets. Ideal for travel, races, or long-distance cycling Stable & Safe: Reinforced 4-pin interface ensures secure connection and charging stability. Built-in safeguards prevent overheating and short circuits Color: Black Material: Plastic Package Contents: 1 x Battery Charger Adapter Note: Other products not included. Light reflection and different displays may cause slight color variations from the actual item. Measurement error allowance: +/- 1-3 cm