Castellated module allows soldering direct to carrier boards. Equipped with high-performance Xtensa 32-bit LX7 dual-core processor, up to 240MHz main frequency. Built in 512KB Static RAM and 384KB ROM, with onboard 4MB Flash and 2MB PSRAM. Supports 2.4GHz Wi-Fi (802.11 b/g) and Bluetooth 5 (LE) to meet diverse wireless needs. Onboard rich peripheral interfaces including 4 x SPI, 2 x , 3 x UART, 2 x I2S, and 2 x ADC, etc.