This is , it is a mini WiFi board based on ESP-8266. 4M Bytes WLAN WiFi Internet Development Board Base on ESP8266 ESP-12F for , 100% Compatible with WeMos .11 digital input / output pins, all pins with interrupt / PWM / I2C / support 1 line (except D0); 1 analog input(3.2V max input). -USB connection; Compatible with ; 1MB Flash; 500mA resettable fuse.WIFI development board,4M bytes.5V 1A switching power supply (switching power supply)onboard. development board compatible with WeMos and can be programmed in the compatible for IDE.color: blueMaterial: PCBPackage Contents:1 x Development BoardOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.