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Features: A3967 microstepping driver. MS1 and MS2 pins broken out to change microstepping resolution to full, half, quarter and eighth steps (defaults to eighth) Compatible with 4, 6, and 8 wire stepper motors of any voltage Adjustable current control from 150mA/phase to 750mA/phase Power supply range from 7V to 30V. The higher the voltage, the higher the torque at high speeds. Package Included: 1*Easydriver Stepper Stepping Motor Driver Board for Arduino A3967 V44 Shield If you for any reason are not happy with any product supplied , please do not hesitate to contact us and we will do our best to solve your problem .