1. The Current Level Can Be Adjusted To Meet Your Application Needs.2. Automatic Half-Flow Adjustable.3. Adopt 6N137 High-Speed Optical Coupler To High-Speed Synchronization.4. Plate Printing Setting Instructions, It Can Be Operated Without Instructions.5. Thick And Close-Toothed Radiator Is Used For Good Heat DissipationWorking Voltage DC 10V-35V. It Is Recommended To Use Switching Power Supply DC 24V Power Supply.Adopt 6N137 High-Speed Optical Coupler To High-Speed Synchronization. TB6560AHQ New Chip Is Adopted, Which Has Low-Voltage Shutdown, Overheating Shutdown And Overcurrent Protection Circuits To Optimal Performance.Rated Maximum Output: 3A, Value 3.5A.Suitable For Two-Phase/Four-Phase/Four-Wire/Six-Wire Stepper Motors Within 42, 57 Steps Within 3A, Not Suitable For Stepper Motors Exceeding 3A.Automatic Semi-Flow Function.Subdivision: Full Step, Half Step, 1/8 Step, 1/16 Step, Maximum 16 Subdivisions.Colour:As ShownMaterial:PCBSize:about 50 x 75 x 35mm(Width*Length*Height)Package Contents:1 Set Of Motor Driver Motherboard AccessoriesNote:Different Batches May Have Differences In Product Appearance, Color, And Printed Characters, Which Will Not Affect The UseThe Wiring Should Be Checked Repeatedly Before Being Powered On. Connecting The Wrong Wire May Burn Out The Chip! The Set Current Should Not Exceed The Rated Current Of The MotorOnly 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.