This is a mount adapter that allows you to use Canon EF/EF-S lenses with Sony E-mount cameras (α6400, α6700, α7Ⅲ, α7 IV, etc.) while maintaining autofocus and electronic control. It supports EXIF transmission, aperture control, and AF. It also features a detachable tripod mount (1/4 inch). It supports firmware updates (Micro-USB). The firmware is currently the same as when purchased. The outer box is dirty, but the item is almost unused. The terminal cap is missing.