Features: This is an intelligent hardware development kit that supports the cloud As long as you know C language, you can use Witty Cloud SDK to quickly realize secondary development This small Wifi transciever is the perfect solution for home Automation and IoT applications. The ESP8266 highly integrated chip, including antenna switch balun, power management converter, so with minimal external circuitry. Features Energy saving VoIP quickly switch between the sleep / wake patterns, with low-power operation adaptive radio bias, front-end signal processing functions. Micro USB connection for power or programming Specification: Model: ESP8266 Material: Plastic,Electronic components Color: black Size: 30*30*15mm/1.2*1.2*0.6in Weight: Approx.12g/0.4oz Package list: 1 x WIFI Witty Cloud Development Board 1、100% brand new and high quality 2、This is an intelligent hardware development kit that supports the cloud 3、As long as you know C language, you can use Witty Cloud SDK to quickly realize secondary development 4、This small Wifi transciever is the perfect solution for home Automation and IoT applications. 5、The ESP8266 highly integrated chip, including antenna switch balun, power management converter, so with minimal external circuitry.