1. 448 KB ROM,520 KB SRAM,16 KB RTC SRAM2. QSPI supports multiple flash/SRAM3. Built in 8 MHz oscillator4. Support self calibration5. Built in RC oscillator, supports self calibrationSupports external main crystal oscillators ranging from 2 MHz to 60 MHz (currently only 40 MHz crystal oscillators are supported if Wi Fi/Bluetooth functionality is used)Supports external 32 kHz crystal oscillator for RTC, supports self calibration2 timer groups, each consisting of 2 64 bit universal timers and 1 main system watchdog1 RTC timerRTC watchdog34 GPIO ports 12 bit SAR ADC, up to 18 channelsEthernet MAC interface with dedicated DMA, supporting IEEE 1588Dual Line Automotive Interface (TWAI) Compatible with ISO11898-1) IR (TX/RX)Product Parameters1) for Adopting the V3 version module ESP32-WROOM-32E from Lexin2) M4 positioning hole diameter: 4.7mm, compatible with for Lego3) Software supports for Mixly, for Arduino IDE, for MicroPythonColor: BlackMaterial: PCBPackage Contents:1 x Esp32 Development BoardOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.