This is a mount adapter for Canon EF lenses to Sony E-mount cameras from Sigma. It supports full-frame sensors, so it can be used with the α7 series, etc. Operation has been confirmed. There are only a few minor scratches, and it is in good condition. Included accessories are the instruction manual, front and rear caps (the front cap is Canon, not Sigma), and a USB cable for firmware updates. The lid of the outer box is torn.