1. The output current is steplessly adjustable to meet your various application needs.2. Automatic semi-flow function. And it is equipped with an automatic half-flow switch, which is easy to use.3. 6N137 high-speed optical coupling is used to ensure high-speed without losing step.4. The subdivision setting instructions are printed on the back of the board.5. Adopt enlarged radiator for good heat dissipation. With output short circuit protection function, worry-free use. Adopt common anode input mode, there are two input terminals, wiring is more convenient.1) Working voltage DC 10V-45V. It is recommended to use a switching power supply DC32V for power supply.2) 6N137 high-speed optical coupling is used to ensure high-speed without losing step.3) Using Toshiba's high-current, high-voltage TB6600HG brand original chip, there are low-voltage shutdown, overheating shutdown and overcurrent protection circuits, and short circuit protection is added compared to TB6560.4) Rated maximum output: ±4.5A.5) Suitable for 42, 57, 86 two-phase/four-phase/four-wire/six-wire stepper motors within 4.2A.6) Automatic half-flow function.7) Subdivision: full step, half step, 1/4 step, 1/8 step, 1/16 step, big 16 subdivisions.size: 50 x 82 x 35MMMaterial: PCBcolour: green + silverPackage Contents:3 x TB6600 Stepper Motor Driver BoardOnly 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.