Compatible with Cfexpress 4.0, allowing for faster read and write speeds than standard Type A cards. I purchased six of these for use with my SONY camera, but I was able to get Lexar Gold cards at a lower price, so I no longer need four of them. I'm selling them for less than the retail price, so please consider purchasing them if you need them. They will be wrapped in bubble wrap and shipped via Nekopos (a Japanese delivery service). Nextorage Cfexpress 4.0 Type A 512GB A2SE, new and unopened.