1,Circuit optimization design, and stable performance, suitable for long term work. 2,Digital motor speed control is noise free and vibration free, with power indicator light. 3,400w motor output, 90-1400rpm / 90-1700rpm speed control range, with running stop braking function. 4,Small size, light weight, lightweight and portable, easy to carry, convenient to install, can meet your needs. 5,UX-52 Electric motor speed controller is operable at -10 to 50°C, and can be stored at -20 to 60°C. Item Type: Motor Speed Control Material: ABS Rated Voltage: 220-230V Operating Voltage Range: 10% Power Frequency: 50 / 60Hz ≤ 2% Motor Output: 400w Speed Control Range: 90-1400rpm / 90-1700rpm Speed Change: 5% Speed Setting: Continuous Control: Electronic Speed Control Motor Electronic Valve: 0.5S Parallel Operation: Not Applicable Soft Stop/Start: None Operating Temperature: -10-50℃ Storage Temperature: -20-60℃ Suitable for Motors: Induction, Reversible 1 x Speed Control 1 x Line Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.