Working voltage: TYPE-C 5V SPI Flash: Default 32 Mbps Serial port Speed: 115200BPS Frequency range: 2412-2484MHZ Bluetooth-compatible protocol: Bluetooth-compatible 4.2BR/EDR and ble standards WIFI protocol: 802.11B/G/ N Antenna form: onboard PCB antenna, gain 2DB Supported interfaces: UART, SPI, SDIO, I2C, PWM, I2S, IR, ADC, DAC