Ring:bit expansion board: A simple PCB for the micro:bit. (1)Extends the micro:bit’s 3 GPIO ports. (2)Convert the P0/P1/P2 port to the common GVS port. (3) loaded with 3 pieces AAA batteries to drive the car or other accessories. Six Fun Cases In One Kit: kids can build 6 shapes, including traffic lights, bricks car, temperature-controlled fans, smart desk lamp, wipers and trebuchet. Well-designed Assembly Instructions and Courses: it makes the kids learn the coding easily as well as how to build blocks in an interesting way. Almost 200 Pieces Bricks: In fact, children can use these rich building blocks to build more favorite shapes