Main Chip: Realtek RTL8720DN Wireless: Dual-Band Wi-Fi (2.4GHz & 5GHz) + Bluetooth 5.0 BLE Processor: Dual-Core ARM (High-Performance + Low-Power MCU) Flash Memory: Typically 2MB (some versions 4MB) Interfaces: GPIO, UART, SPI, I2C, PWM, ADC, SWD