This is a Viltrox mount adapter that allows you to use Sony E-mount lenses with autofocus on Nikon Z-mount cameras. It's an ultra-thin adapter. I bought this in anticipation of purchasing a Nikon Z camera, but I've decided not to, so I'm selling it. Viltrox makes lenses for various manufacturers, and I purchased this adapter because it seemed reliable, as it was even recommended by overseas video creator Matti Haapoja. I acquired this on a flea market. It's new and unused with the shrink wrap still on, as shown in the photos. However, I haven't been able to confirm its operation, so there's a possibility of initial defects. I will not be able to provide support, and I cannot offer returns or refunds in the event of any issues. Please understand and accept this before purchasing. I purchased it with the same understanding. It appears to be the type that allows for firmware updates, but the current firmware version is unknown. You will need to handle the update yourself. It should be straightforward, as you can update it by connecting the included cable to the adapter. I will wrap it in bubble wrap and ship it in a cardboard box via Mercari delivery (Yamato Transport). I will request a pickup, so please understand that it may be shipped the next day depending on the time of day. Yamato usually has same-day pickup until 5 PM. I will respond quickly and carefully, so thank you for your understanding.