Atari 8bit A8PicoCart flash cart. Shipped with USPS Ground Advantage.

When plugged into a PC or Mac by USB-C it becomes a Mass Storage device allowing ROM/CAR/XEX & ATR files to be copied to the cartridge. When plugged into an Atari these files are shown on the menu and the device will either emulate the selected cartridge type or act as a XEX file launcher. Limited support for ATR files allowing you to do some programming and save your work to an ATR file.

Work by Robin Edwards - GitHub:

https://github.com/robinhedwards/A8PicoCart