Type-C Charging Convenience: Convert your 4-pin charging interface to Type-C, enabling universal compatibility with modern Type-C cables, power supplies or laptops for charging on the go. Emergency Power Supply: Use any Type-C power source (e.g. phone charger, portable battery) to charge your DI2 electronic transmission system during bike 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, racing or long-distance cycling. Stable & Safe: Reinforced 4-pin interface ensures secure connection and charging stability. Built-in protections prevent overheating and short circuit. Color: Black Material: Plastic Package Contents: 1 x Portable Di2 Charger Adapter (The words on the product may vary due to different production batches, but it does not affect the use) Only the above package contents, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture to be slightly different from the real thing. The measurement allowed error is +/- 1-3 cm.