This is a kind of quality 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. Anti-slip rotation knob design for easy adjust the working speed. Corotation and reverse adjustable, easy to adjust according to your demands. 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: Speed Controller Model: US-52 Material: ABS Power: 400W Item size: 113 * 100 * 60mm / 4.45 * 3.94 * 2.36in Item weight: 249g / 8.78ounce Package size: 120 * 107 * 85mm / 4.72 * 4.21 * 3.35in Package weight: 281g / 9.92ounce Packing List: 1 * Speed Controller 1 * Flat-plug Cable (single-row 6 pin type)