This is pulse module, can provide 2.5 KHZ-68 KHZ frequency, supply signal to stepper driver. If you want to control the stepper motor, you still must use a motor driver. If you want to change the frequency range, you can change C46 capacitance. supply: DC15-80V or DC 12V.Motor reversing and the rotation, stop and run can be controller by keys.Motor speed can be controlled by adjusting the potentiometer.color:As shownMaterial:PC+ metalPackage Contents:1 x Stepper motor driver controllerOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.