brand new and high quality Material: Electrical components Color: See pictures This is pulse module, can provide 2.5 khz-68 kHz frequency, power signal for stepper driver. If you want to control the stepper motor, you should still use a motor driver. If you want to change the Frequency Range, you can change C46 capacitance. Power supply: DC15-80V or for DC 12V. Reverse engine and rotation, stop and run can be controller by keys. The motor speed can be controlled by adjusting the potentiometer. Size: 73*51*37MM Quantity: 1Pc Not Retail Package Note: Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you Package includes: 1Pc x Stepper Motor Module Pulse Generator Signal Driver Controller Speed Controller