The board is compatible with the official Version. An additional row GPIOs has been added for convenient extra expansion. In the WIFI version, the USB port can be switched between the main chip and ESP32. In the official version, soldering with a soldering iron is required for the switch. In our improved version, a DIP switch is used for switching, making it more convenient. Name:For R4 Minima Accessory Type:Development board Compatible With:For R4 Colour:Blue Material:ABS Package Contents: 1 * Development board 1 * type-c 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.