Bare Espressif ESP32 SoC IC in QFN-48 6x6 mm package. Dual-core Xtensa LX6 32-bit MCU up to 240 MHz with integrated 2.4 GHz Wi-Fi 802.11 b/g/n and Bluetooth 4.2 BR/EDR + BLE. 520 KB SRAM, 448 KB ROM, no in-package flash or PSRAM (external SPI flash required). 34 programmable GPIOs (5 strapping, 6 input-only), 18 ADC channels, 2 DACs, 10 capacitive-touch inputs, 4 SPI, 2 I2C, 3 UART, 2 I2S, SDIO host/slave, Ethernet MAC, TWAI (CAN 2.0), pulse-counter. Hardware AES/SHA/RSA acceleration. NRND (Not Recommended for New Designs) status as of datasheet v5.2.