1, the output current is infinitely adjustable to meet your application requirements. 2, automatic half current function. And a semi-automatic flow switch, easy to use. 3, the use of high-speed optical coupling 6N137 high-speed without losing step. 4, on the back panel are subdivided setup instructions. 5, used to increase the heat sink, good heat dissipation. 6, output short-circuit protection, the use of mind. 7, using common anode input mode, there are two input terminals, wiring more convenient. Operating voltage DC 10V-45V. DC32V switching power supply is recommended. new high current, high voltage TB6600HG new chip, there are low-pressure shut-off, overheating parking and over-current protection circuit, short-circuit protection and increased compared to TB6560. Rated maximum output reached: 4.5A. for 4.2A 42,57,86 within the two-phase / four-phase / four-wire / six-wire stepper motor. Subdivision: full step, half step, 1/4-step, step 1/8, 1/16-step, up to 16 segments. Colour:green Material:PCB Size:50 x 82 x 35mm Package Contents: 1 * Motor driver board Only the above package content, other products are not included. Note: Light 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.