DC 9-42V power supply, compatible with 12-30V input Control signal input voltage: 3.3-24V universal (no external resistor required) Subdivision accuracy: 1-32 step selectable Output current: 4.0A H-bridge bipolar constant current drive Upgraded version of TB6600, suitable for 57 and 42 type two-phase hybrid stepping motors with phase current up to 4.0A Features 7 selectable microstep settings (1, 1/2, 1/4, 1/8, 1/16, 1/32) via 6-bit DIP switch Adjustable output current with 8 levels (0.5A, 1.0A, 1.5A, 2.0A, 2.5A, 2.8A, 3.0A, 3.5A) Designed for use in small to medium-sized automation equipment and machinery Common applications include engraving machines, marking machines, cutting machines, laser phototypesetters, plotters, CNC machine tools, crystal grinding machines, and automatic assembly equipment Optimized for 57 and 42 stepper motors with torque of 1.8N·m or less Equipped with high-speed optocoupler isolation on input signals Includes built-in thermal protection and overcurrent protection Automatic half-current mode to reduce heat generation Motor noise optimization function Note: Product design may vary slightly between batches; such variations do not affect performance or functionality Color: As shown in image Material: ABS Package Contents: 1 x Stepper Motor Driver Kit (Other accessories or items not included) Note: Lighting conditions and monitor settings may cause slight color differences between the product image and actual item. Measurement tolerance: ±1-3 cm