Compatible with building block shapes. It can be used with block series sensors to complete shapes and interesting experiments. It can be quickly connected with PH2.0 cable. 4-way motor control + 8-way steering gear control, easy to meet drive requirements. The expansion board adopts a central axis design as a whole, with left and right symmetry, which is very suitable for expanding the shape of building block robots and building block cars. The expansion board has a of functions onboard, such as Wifi camera serial port, 7 anti-reverse IO module ports, 4 I2C ports, 4 DC motor ports, 8 servo ports, 4 RGB lights, buzzer, etc. It is convenient for users to complete DIY. Onboard I/O devices: passive buzzer, 4 programmable RGB lights Motor interface: four-way DC motor (voltage is taken from the battery, current 1-3A), Servo interface: eight-way servo Expansion interface: 17Pin expansion IO port, module interface (serial port) 1, module interface (I2C) 4, module interface (single/two-way IO) 6, module interface (three-way IO) 1 Protection scheme: reverse polarity protection, low voltage protection, overcurrent protection Special socket: 1 gold finger interface Power supply interface: 18650 battery holder, external 3-5V power supply, -USB power supply Output power: 5V (MAX: 1A), 3.3V (MAX: 0.5A) Colour:black Material:plastic Package Contents: 1 x Expansion Board 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.