1) Working voltage for DC 10V-35V. DC24V switching power supply is recommended. 2) the use of high-speed optical coupling 6N137, ensure high speed without losing step. 3) for Toshiba TB6560AHQ new original chip, there are low-pressure shut-off, overheating parking and over-current for protection circuit to ensure for optimum performance. 4) The maximum rated output: 3A 5) for 42, 57 3A stepper within two-phase / four-phase / four-wire / six-wire stepper motor is not suitable for more than 3A stepper motor. 6) automatic semi-flow function. 7) Subdivision: full step, half step, step 1/8, 1/16-step, 1/32-step,up to 32 segments. 8) Volume: Width Length 75 * 50 * high 35 (MM) Similar products in features: 1, the current level by adjustable to meet your various application requirements. 2, semi-automatic adjustable flow. 3, using high-speed optical coupling 6N137, ensure high speed without losing step. 4, plate printing setup instructions, can operate without manual.