Type-C Charging Convenience: Converts your 4-pin charging interface to Type-C, enabling universal compatibility with modern Type-C cables, power sources, or laptops for on-the-go charging. Emergency Power Supply: Use any Type-C power source (e.g., phone charger, portable battery) to charge your Di2 electronic transmission system during rides, ensuring no downtime. Perfect Compatibility: Designed for 12-speed EW-EC300 and Di2 systems (R9200/R8100/R7100 series), seamlessly integrates with official accessories. Compact & Portable: Ultra-small design (0.4 inch / 10 mm connector) 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 Portable Di2 Charger Adapter (product text may vary slightly due to different batches, but this does not affect functionality). Only the above package content is included; other products are not included. Note: Light reflection and different displays may cause slight color differences between the item in the picture and the actual product. Measurement allows an error of +/- 1-3 cm.