This module does not have any protection circuit, please be careful when using it. This product has been fully tested and has been applied to engraving machines, placement machines and other equipment. The working voltage is DC 10V-35V. It is recommended to use a switching power supply DC24V for power supply. Adopt 6N137 high-speed optical coupler to high speed without losing step. Adopt for TB6560AHQ original-chip, which has low voltage shutdown, overheating parking and overcurrent protection circuits. The rated maximum output is: 3A, 3.5A. Suitable for 42, 57 stepping two-phase/four-phase/four-wire/six-wire stepper motors within 3A, not suitable for stepper motors exceeding 3A. Automatic half-current function. Subdivision: full step, half step, 1/8 step, 1/16 step, maximum 16 subdivisions. The current level is adjustable to meet your various application needs. Adopt 6N137 high-speed optical coupler to high speed without losing steps. Adopt thick and dense tooth heat sink for good heat dissipation. Note:due to different production batches, there are differences in printing screen printing, which does not affect the use. Color:Green Material:PCB+Plastic Package Contents: 1 * TB6560 3A 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.