This is the Megadap ETZ21 Pro mount adapter. Due to a change in my camera system, I've decided to standardize my lenses to Nikon, so I'm selling this mount adapter. This adapter allows you to mount Sony E-mount lenses on Nikon Z-mount cameras, making it a great way to utilize your existing lens collection. There are many reviews on YouTube that explain its features in detail, so please refer to them. Purchase date: About 3 months ago Usage: Approximately 10 times Operation: Works perfectly, no issues. Accessories: All original accessories included. Storage: Stored in a dry cabinet. Shipping will be via Mercari. I will ship promptly. Thank you.