The Espressif ESP32-C3-WROOM-02U-N4 is a Wi-Fi and Bluetooth 5 LE module based on a single-core 32-bit RISC-V processor running up to 160 MHz. It features 4 MB external flash, 400 KB SRAM, support for 2.4 GHz Wi-Fi and BLE mesh, and a U.FL connector for external antennas, with industrial-grade operation from -40 °C to +85 °C.