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.Power 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 potentiometerColour:greenMaterial:plasticSize:about 73 x 51 x 37MM Package Contents:1 * Stepper motor Pulse Signal Generator module driver controller Speed RegulatorOnly the above package content, other products are not included.Note: Light 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.