NodeMCU V3 ESP8266 IoT Board
✅Power: 4.5V ~ 9V (10VMAX), USB-powered
✅Current: 70mA (max 200mA) for continuous transmission, 200μA for standby
✅Transfer rate: 110-460800B/s
✅Flash size: 4MB
✅Built-in PCB antenna
✅WiFi at 2.4GHz, support WPA/WPA2 security mode
✅Wireless 802.11 b/g/n standard
✅Support UART / GPIO data communication interface