Compatible with building block shapes. Can be used with sensors in the block series to complete shapes and interesting experiments. Quickly connects with PH2.0 cable. 4-way motor control + 8-way steering gear control, easily meets drive requirements. Expansion board features a central shaft design with left-right symmetry, perfect for expanding building block robots and cars. Onboard features include Wifi camera serial port, 7 anti-reverse IO module ports, 4 I2C ports, 4 DC motor ports, 8 servo ports, 4 RGB lights, buzzer, and more. Convenient for users to complete DIY projects. Built-in I/O devices: passive buzzer, 4 programmable RGB lights. Motor Interface: Four-way DC motor (voltage from 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 System: 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, Micro-USB power supply. Output Power: 5V (MAX: 1A), 3.3V (MAX: 0.5A). Color: Black Material: Plastic Package Contents: 1 x Expansion Board Note: Light reflection and different displays may cause the color of the item in the picture to be slightly different from the real thing. The allowed measurement error is +/- 1-3 cm.