NodeMCU ESP-32 specifications:
Wireless Module – ESP-WROOM-32 with Espressig ESP32 dual core processor with 802.11 b/g/n WiFi and Bluetooth 4.0 LE
Expansion – 2x 19 pin headers with GPIOs, Analog inputs (ADC), UART, I2C, VP/VN, etc…; breadboard compatible
USB – 1x micro USB port for power and programming
Misc – BOOT and EN buttons, red (power) and blue (GPIO2) LEDs
Power Supply – 5V via USB or Vin pin
Dimensions – 51.4 x 28.3 mm