Usage Tips:Fangrui Product Details Simple Step And Direction Control Interface. Can Interface Directly With 3.3v And 5v Systems. Over-temperature Thermal Shutdown, Over-current Shutdown And Under-voltage Shutdown Short-bottom And Short-load Protection Please Note: The Physical Slightly Color Difference Or Difference, Please Do Not Mind, Does Not Affect The Use, Thank You! Caution! Please Mind The Power Polarity And Drivers Direction. Please Dont Put The Drivers Or Motors On/off While Power On. Please Disconnect All Motors When Adjust Driver Current. Colour:photo Color Material:pcb Package Contents: 5 X Stepper Motor Driver 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.