1) Working voltage DC 10V-35V. It is recommended to use a switching power supply DC24V for power supply. 2) Adopt 6N137 high-speed optical coupler to high speed without losing steps. 3) Adopt TB6560AHQ new chip, which has low voltage shutdown, overheat parking and overcurrent protection circuits to performance. 4) Rated output: ±3A, 3.5A. 5) Suitable for two-phase/four-phase/four-wire/six-wire stepper motors within 42, 57 steps of 3A, not suitable for stepper motors exceeding 3A. Automatic half-current function. Subdivision: full step, half step, 1/8 step, 1/16 step, 16 subdivision. Colour:green Material:PCB Due to different batches, there may be differences in product appearance and printed text, which not affect use Package Contents: 3 x TB6560 Stepper Motor Driver Board 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.