This product is expansion board plug-in, motor drive expansion board, multi-function expansion board, the board IO port, IC2 interface, UART serial port, ultrasonic module interface, motor encoder interface, supply interface. interface, lead to I2C, UART and other communication interfaces and a variety of sensor interfaces, you can access more expansion devices.Plug and play, welded Pin pins, easy access to a variety of modules board interface (default 5V)Applicable to main control boardsize: 53 x 5 x 45mmMaterial: PCBcolour: blackPackage Contents:1 x expansion 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 picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.