Feature: Use low-power dual-core 32-bit CPU, which can be used as an application processor. The main frequency is up to 240MHz, and the computing power is up to 600 DMIPS Built-in 520 KB SRAM Support UART/SPI/I2C/PWM/ADC/DAC and other interfaces Support OV2640 and OV7670 cameras, built-in flash Support picture WiFI upload Support TF card Support multiple sleep modes. Support STA/AP/STA+AP working mode Specification Working voltage 4.75-5.25V SPI Flash default 32Mbit RAM internal 520KB Wi Fi 802.11b/g/n/e/i BLE 4.2BR/EDR and BLE standard Support interface (2Mbps) UART, SPI, I2C, PWM IO port 9 Serial port rate default 115200bps Spectrum range 2400 ~2483.5MHz Antenna form Onboard PCB antenna, gain 2dBi Image output format: JPEG (only OV2640 support), BMP, GRAYSCALE Packaging method DIP-16.