ESP32 module on a PCB with level shifting circuitry A tri-state chip for MOSI so you can share the SPI bus with other devices Fully assembled and tested, pre-programmed with ESP32 SPI WiFi co-processor firmware Send basic but powerful socket-based commands over 8MHz SPI for high speed data transfer Works great with CircuitPython, a SAMD51/Cortex M4 minimum required since we need a bunch of RAM