Type-C Charging Convenience: Converts 4-pin charging interface to Type-C, enabling compatibility with modern Type-C cables, power banks, or laptops for convenient on-the-go charging. Emergency Power Supply: Allows use of any Type-C power source such as phone chargers or portable batteries to charge DI2 electronic transmission systems during rides, 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 safeguards against overheating and short circuits. Color: Black Material: Plastic Package Contents: 1 x Portable Di2 Charger Adapter (product labeling may vary due to different batches, but does not affect functionality) Only the above package content is included; other items are not part of this package. Note: Due to lighting reflections and differences in display screens, the color of the item in the image may vary slightly from the actual product. Measurement error is +/- 1-3 cm.