“FujiNet is an device for Atari 8-bit computers (400, 800, XL and XE series, and XEGS). It started as a network adapter that attaches to the SIO (Peripheral) port of an Atari 8-bit computer system but has become an all encompassing SIO peripheral emulator. The hardware is a design based on the ESP32-WROVER module and contains a custom 3D printed SIO Plug and Receptacle.”

Source : https://github.com/FujiNetWIFI/fujinet-platformio/wiki/What-is-FujiNet%3F

Detailed documentation can be found here : https://github.com/FujiNetWIFI/fujinet-platformio/wiki

Color of the case is chosen randomly.