Motor control board Speed RPM Display Stepper Motor Driver Controller Board Speed Adjustable Reversal

Positive and reverse can be clicked; Press the forward button; Press and hold the forward button; Loosen the stop; Press the reverse button; Press and hold the reverse; Loosen the stop. Self-locking positive and negative; Press potentiometer forward; Press stop again; Press reverse again; Press stop again. Speed range: 0.1-999 rpm; off memorable and last set speed value. Colour:green Material:plastic Package Contents: 1 * Stepper Motor Driver Control Board 1 * 6P cable