ESP8266 NodeMcu Lua ESP-12E WIFI Development Board Wireless 802.11 b / g / n standard Support STA / AP / STA + AP three operating modes Built-in TCP / IP protocol stack to support multiple TCP Client connections (5 MAX) D0 ~ D8, SD1 ~ SD3: used as GPIO, PWM, IIC, etc., port driver capability 15mA AD0: 1 channel ADC Power input: 4.5V ~ 9V (10VMAX), USB-powered Current: continuous transmission: 70mA (200mA MAX), Standby: &lt;200uA Transfer rate: 110-460800bps Support UART / GPIO data communication interface Remote firmware upgrade (OTA) Support Smart Link Smart Networking Working temperature: -40  ~ + 125  Drive Type: Dual high-power H-bridge driver