1Speed Control Knob: This knob can adjust motor speed, easy to use 2Clear operation panel and dial, the pointer can point speed accurately 3When the load is fan or pump, the power saving effect is remarkable 4With IP5X dustproof class, can be used for panel embedded or wall mounted, bottom incoming wire 5Used for speed control of electromagnetic asynchronous motor (slip motor), realizing stepless adjustment of constant torsion
