http://cnccraftshop.com/ 1) Working voltage DC 10V-35V. DC24V power supply switching power supply is recommended. 2) using 6N137 high-speed optical coupling, ensure high-speed without losing step. 3) Toshiba TB6560AHQ new original chip, there are low-voltage shutdown, overtemperature and overcurrent protection circuit parking, to ensure optimum performance. 4) Rated maximum output: ± 3A, peak 3.5A. 5) Suitable 42,57 3A stepper within two / four phase / four wire / six wire stepper motor, not suitable for more than 3A stepper motor. 6) automatic half current function. 7) segments: full step, half step, 1/8 step, 1/16 step, up to 16 segments. 8) Dimensions: width 50 * length 75 * H 35 (MM) Similar products in the following features: 1, the current level by adjustable to meet your various application requirements. 2, automatic semi-flow adjustable. 3, the use of high-speed optical coupling 6N137, ensuring high speed without losing step. 4, plate printed setup instructions, no instructions can operate. 5, using thick fine-toothed radiator, good heat dissipation.