board integrates: megar3 atmega2560 and wifi esp8266 with 32MB memory. All modules can be used alone or together. And each has its own pin header. Convenient solution to develop new projects, un and wifi. You can update and firmvare sketch for atmega2560 and foresp8266 via USB. This board comes with a USB serial converter ch340g. Using this board is very simple. Ancelotti's DIP switch board, connect the modules. For example, a USB interface: USB and atmeg2560, and esp8266, atmega2560 and esp8266. Material: plastic colour: As shown Package Contents: 1 x development board 1 x micro-cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.