Sigma FD 11 Flash USB Dock for Canon DSLR Cameras - High-Speed File Transfer & Backup Solution for Professional Photographers (Perfect for Studio Work & On-the-Go Shooting)

By connecting the flash to your computer with the Sigma FD-11 Flash USB Dock, you can update the flash firmware using Sigma Optimization Pro Software. This allows you to plug your flash in via a USB connection and install firmware updates for enhanced functionality and compatibility.