The SIGMA USB DOCK is a dedicated lens accessory for the Contemporary, Art, and Sports lines, allowing users to connect to a PC via USB cable to update lens firmware and adjust focus positions. ★ Photos added 2025/03/11 (photos 4 and 5) This is the screen when connected to a PC via USB cable after installing SIGMA Optimization Pro. ★ Purchased in 2018. ★ Used only a few times and stored at home. ★ Please refer to the manufacturer's product page for detailed specifications. https://www.sigma-global.com/jp/accessories/usb-dock-ud01/ ★ This is a used item that has been stored at home for a long time. Please refrain from purchasing if you are not comfortable with used items or are overly sensitive. --- The following is an AI-generated description. The SIGMA USB DOCK UD-01 is a convenient accessory that allows for firmware updates and setting changes for Nikon lenses. - Brand: SIGMA - Model Name: USB DOCK UD-01 - Compatibility: For Nikon - Included Accessories: USB cable, instruction manual - Port Type: USB - Color: Black Thank you for viewing.