Fangrui Product Details Product Introduction:this Expansion Board Is A Full-featured Robot Expansion Version On Market That Can Support Multiple Motors/stepper Motors/servos (stepper/motor/servo) At The Same Time,and Can Be Stacked To Expand More Control Interfaces.its Especially Fit For Various Applications Such As Diy Robots,smart Cars,robotic Arms, /tilts,etc.the Control Interface Simply Adopts The I2c Interface And Is Compatible With 3.3/5v Levels,so Its Also Fit For Other Development Boards On Market. Note: Due To Different Batches, The Appearance, Color, And Printed Words Of The Product , Which Does Not Affect Its Use. Features: 1. Single Power Supply, The Normal Working Power Supply Voltage Range Is 5v~12v; (please Select The Correct Input Power Supply Voltage And Current According To The Motor Control Voltage You Control) 2. Complete Data Input/output Through The I2c Bus Of For The , 3. One I2c Interface, Compatible With 5v Level, Can Be Controlled By For Or Other Development Boards 4. One I2c Interface Can Be Connec