Features: It have high compatibility and can be used in combination with various programming software, such as MicroPython, Scratch, etc., which expands the application scope of the product. IO BIT V2 expansion board design: provide more IO interfaces, which is convenient for users to carry out more complicated DIY electronic projects and programming practice. Perfect cooperation with development board provides users with more hardware interaction and function expansion option. It have a variety of interfaces types, including digital interfaces, analogs interfaces, I2C interfaces, etc., to meet the different needs of users. It is easy to operate, suitable for enthusiasts and beginner, and supports the rapid construction of various electronic prototype systems and small experiments. It is used in courses such as STEAM education and programming teaching to help students learn basic electronic knowledge and programming skills. Individual users who are interested in electronic DIYer and programming can create and practice through this product. It is used for students' electronic experiment and programming teaching to help them cultivate their practical ability and logical thinking. Specifications: Size:Approx.78.5x64.5mm/3.09x2.54inch USB power supply port (5V). Battery box power supply port (5V-9V). Power switches. UART protocol port. IIC protocol port. Address of antiskid plugs in interfaces. Motor driver chip. Control version of alligators clip interfaces. Package Includes: 1 Set Engraving Machine Control Board note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you donot mind befores you order. 2.Due to the differences between different monitors, the picture may not reflect the actual coloring of the item. Thanks for your understandings.