ESP32 SoC (System on Chip) with WiFi and Bluetooth BLE
40MHz Crystal for CPU, 32.768KHz for RTC and low power operation
4MB Flash (32MBit)
FTDI231 for the USB to Serial communication
Auto-reset for automatic flash of new program
On board 3.3V, 0.5A LDO, tested to work upto 1A
2.5dBi Peak Gain, 0.5dBi averange gain antenna