ESP32 is based on the ESP32 SoC containing onboard WiFi & BLE. ESP-32 integrates a dual-core processor and features 448 kByte ROM, 520 kByte SRAM, 16 kByte SRAM in RTC, 802.11 bgneI Wi-Fi, Bluetooth v4.2 BREDR & BLE, Clocks & Timers, abundant peripheral interfaces and security mechanisms.