Power supply: DC15-80V or DC 12V. Motor reversing and the rotation, stop and run can be controller by keys. 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. Motor speed can be controlled by adjusting the potentiometer., Weight: 0.21384839414 pounds, Manufacturer: Ynusgeyx