Type-C Charging Convenience: Converts 4-pin charging interface to Type-C, enabling compatibility with Type-C cables, power banks, or laptops for on-the-go charging. Emergency Power Supply: Use any Type-C power source, such as a phone charger or portable battery, to charge your DI2 electronic transmission system while riding, helping prevent downtime. Perfect Compatibility: Designed for 12-speed EW-EC300 and DI2 systems (R9200/R8100/R7100 series), integrates seamlessly 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 stable charging. Built-in protection against overheating and short circuits. Color: Black Material: Plastic Package Contents: 1 x Portable Di2 Charger Adapter (product markings may vary slightly due to different batches, but this does not affect functionality). Note: Light reflection and differences in display screens may cause slight variations between the color shown in the image and the actual product. Measurement may vary by +/- 1-3 cm.