Check the listing for details. Sigma FD-11 Flash USB Dock for Nikon #801955. Condition: New. Listed at 59.00 USD. AUTHORIZED DEALER Sigma FD-11 Flash USB Dock for Nikon Manufacturer Part # 801955 Overview: Update your EF-630 Electronic Flash for Nikon using Sigma's Optimization Pro software on your computer with this FD-11 Flash USB Dock. This allows you to plug your flash in via a USB connection and install firmware updates for enhanced functionality and compatibility. Features:For EF-630 Electronic FlashUpdate Flash FirmwareConnects to Computer via USBSpecifications:Connectors: Hot shoe, USBPackage Includes:Sigma FD-11 Flash USB Dock for NikonIF YOU HAVE ANY QUESTIONS OR CONCERNS WITH THE TRANSACTION, PLEASE EMAIL US BEFORE LEAVING FEEDBACK. WE CARE VERY MUCH ABOUT OUR CUSTOMERS' SATISFACTION, AND WILL DO ALL WE CAN TO MAKE YOUR BUYING EXPERIENCE A HAPPY ONE. THANK YOU.