The controllers are easy to program by using the CP2102-USB interface without having to press the flash and reset buttons before each flash operation. The development board has integrating GPIO, PWM, IIC, 1-Wire and ADC all in one board. Support smart link smart networking. The fast and affordable technology for WiFi. Make your development the fastest way combined with firmware Function:Can upload recorded data to remote servers. Can be uesd for an air quality sensor and temperate humidity sensor. Package:6PCS ESP8266 NodeMCU CP2102 ESP-12E Development Board.