This product has the soft-start function, adopts MCU digital control technology, multifunctional design, accurate speed control with stable performance. Adopt digital display menu option for quickly and conveniently modify the setting. The display rate can be set according to the user's display needs, and the display target value can be converted automatically. You can have a try. Features: Adopts MCU digital control technology, multifunctional design, accurate speed control with stable performance. Adopt digital display menu option for quickly and conveniently modify the setting. The display rate can be set according to the user's display needs, and the display target value can be converted automatically. It can realize slow acceleration and slow deceleration. It can be operated by panel and controlled by external switch. The panel knob automatically matching the highest speed, easy to adjust and control, safe. Blocking-protections function to prevents motor and governor from burning out due to blocking.(This function can prevents blocked rotation overload, but it cannot prevents non-blocked rotation overload) Increase circulation operation function. Specifications: Name: Speed Controller Model: UX-52 Main color: black Voltage: 220 V Power frequency: 50/60Hz Motor output: 400W Item size: 100 * 90 * 60mm / 3.9 * 3.5 * 2.4in Item weight: 231g / 8.1ounce Package size: 122 * 105 * 85mm / 4.8 * 4.0 * 3.3in Package weight: 275g / 9.6ounce Packing List: 1 * Speed Controller