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Check the listing for details. Speed RPM Stepper Servo Motor Driver Controller Board Speed Adjustable Reversal. Condition: New. Listed at 21.46 USD. ACC acceleration setting (1-99)1 fastest, 99 fastest, load reset slower, default value 5. P-01 Length value, number of pulses = P-01 d1A/d1b doub: Magnification setting Default 1 0-1000 rpm adjustable.