There are 5 controllers in different power and you can choose you need. It has compact size, high , wide speed controlling range, and long service life. Built-in capacitor, supporting CW/CCW rotation. Speed Control Knob: This knob can adjust motor speed and display in real time. Widely used in packaging, printing, food, electronics, instruments, clothing industry production line for speed drive device., Weight: 0.7495716908 Pounds, Manufacturer: Pomoflexi