2.Powerful motor and servo driver chip, strong driving force.     3.Includes multiple voltage pins for most eexperiments.     4.Compatible with Lego, build better and more creative functions through different building blocks and cooperate with motor: Bit, and give full play to students' creativity.     5.Supports driving 8 servos and 4 DC motors at the same time.          Supports driving two 5-wire stepper motors.     4 RGB full-color lights on board, with passive buzzer.     On-board infrared receiver, infrared remote control via infrared remote control.     One PH2.0-4Pin RGB ultrasonic interface, anti-reverse insertion.     Parameters:     PCB board thickness: 1.6mm     Large round hole diameter: 4.6mm     Product size: 80mm x 57mm x 12mm     Input voltage: 6 - 36V     Colour: Black     material: plastic          Package Contents:1 x Expansion Board          Only the above package content, other products are not included.     Note: Light shooting 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.