This expansion board be designed with bilateral symmetry, on board micro-bit board socket, 18650 battery socket, USB power supply interface, 3-5v external power interface, 4 programmable RGB lights, buzzer, I2C interface , WIFI camera serial port, all kinds of motor interfaces and so on, which is an expansion board designed for micro-bit. It also can be connected with 2 channel stepper motors, 4 channel DC motors, 8 channel servos, coupled with stable power supply scheme and various protection circuits, this expansion board has a powerful ability to drive motor. We expand 17 pin header IO ports to support our sensor modules. The WIFI camera serial interface, IIC interface and holes possible for users to expand into more interesting projects. You can shape with the bricks, connect some electronic devices, and control it by micro-bit programming. It is an excellent choice for your robotic projects based on Micro-bit. On board I/O device: passive buzzer, 4 programmable RGB lights Motor interface: four DC motors (voltage from battery, current 1-3A) Servo interface: 8-channle steering gear Expansion interface: 17Pin expansion IO port, module interface(serial port)x1, module interfaces (I2C)x4, module interfaces(single/two-channle IO)x6, module interface(3-channle IO)x1 Protection scheme: reverse connection protection, low voltage protection, over-current protection Special socket: micro-bit gold finger interface x1 Power supply interface: 18650 battery socket, external 3-5 V power supply, Micro-USB power supply Output power supply: 5V (MAX: 1A), 3.3V (MAX: 0.5A) Colour:Photo Color Material:plastic Package Contents: 1 x expansion board 1 set x accessories 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.