This is a kind of quality digital display speed controller, which adopts ABS flame-retardant housing, wear resistance and can provide long service time. The governor starts slowly and has a soft-start function. The governor starts slowly and has a soft-start function. Anti-slip rotation knob design for easy adjust the working speed. You can have a try. Features: Adopts ABS flame-retardant housing, wear resistance and can provide long service time. The governor starts slowly and has a soft-start function. 400W high power can provides stable performance. It adopts generator feedback voltage control, the control line is: ''yellow'' and ''yellow'' two wires, blue is the ground wire. Digital display design, you can see the rpm value clearly. Anti-slip rotation knob design for easy adjust the working speed. One button to on/off the motor, and please disconnect the powersupply when it is necessary to stop the operation for a long time. Specifications: Name: Digital Display Speed Controller Model: UX-A-52 Material: ABS Power: 400W Item size: 103 * 110 * 62mm / 4.06 * 4.33 * 2.44in Item weight: 333g / 11.75ounce Package size: 119 * 110 * 85mm / 4.69 * 4.33 * 3.35in Package weight: 365g / 12.87ounce Packing List: 1 * Digital Display Speed Controller 1 * Flat-plug Cable (single-row 6 pin type)