The USBNinja cable architecture is distinct from the O.MG cable. Where O.MG uses WiFi + ESP32, the Ninja Cable uses Bluetooth LE + ATtiny85 with V-USB and adds a Hall effect sensor for magnetic ring triggering. The firmware is fully open-source and well-documented. Here's how to build a functional clone, from easiest to most authentic. This is a guide on how to build your own USBNinja cable.