This is a Fringer mount adapter. It's an adapter for using EF lenses on Z mount cameras. It also has electronic contacts. I only used it once with a Nikon ZR, with Sigma 18-35mm and 50-100mm lenses. (When using APS-C lenses, it doesn't automatically crop, so you need to crop manually.) I think the condition is very good. I haven't updated the firmware because there were no problems with the operation, but you can connect it to a PC via USB and update the firmware, so you should be able to use it for a long time. I have confirmed the operation and condition as much as possible and haven't found any problems, but due to the nature of electrical products and to prevent swapping, it is sold as-is, with no claims or returns accepted.