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 including R9200, R8100, and R7100 series; integrates seamlessly with original accessories. Compact & Portable: Ultra-compact design with a 0.4-inch (10 mm) connector for easy storage in bike bags or pockets. Ideal for travel, racing, 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 production 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 up to +/- 1-3 cm.