DC 9-42V power supply, 12-30V power supply is the best The control signal input voltage is 3.3-24V universal (no string resistance required) Subdivision accuracy 1-32 subdivision optional Output current 4.0A H-bridge bipolar constant current drive The upgraded version of TB6600 is a driver suitable for 57/42 type two-phase hybrid stepping motor with phase current below 4.0A. Set 7 kinds of subdivisions (1/2A/2B/4/8/16/32) through 6-bit DIP switch And 8 gear output current (0.5A/1.0A/1.5A/2.0A/2.5A/2.8A/3.0A/3.5A) Widely used in various small and medium-sized automation equipment and hardware, Such as: engraving machine, marking machine, cutting machine, laser phototypesetting, plotter, CNC machine tool, crystal grinding machine, automatic assembly equipment, etc. The best application object is 57 stepper motors and 42 stepper motors with a torque of 1.8N.m and below. 1. Input signal high-speed optocoupler isolation 2. Built-in temperature protection and overcurrent protection 3. Automatic half flow to reduce heat generation 4. Motor noise optimization function Tips:The product may be updated constantly ,Due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does Not Affect Use. Colour:As Shown Material:ABS Package Contents: 1 * Stepper Motor Driver Kit 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.