Size:75*50*35(mm)(LxWxH) / 2.95''x1.96''x1.37'' (approx) Rated maximum output: ± 3A, peak 3.5A. Working voltage DC 10V-35V. Recommended to use a switching power supply DC24V power supply. Using the TB6560AHQ new original chip with low voltage shutdown, overheating stop and over current protection circuit to ensure optimal performance. For two-phase within 42,57 stepping 3A / four-phase / of line four / six-wire stepper motor, and is not suitable for more than 3A stepper motor. Automatic half current function. 6N137 high-speed optical coupling, guarantee high speed without losing step. Subdivision: whole step, half-step, step 1/8, 1/16 step, a maximum of 16 Subdivisions.