Versatile Motor/Fan Controller: This dc motor governor is designed for dimming and speed control of motors and fans, supporting a wide voltage range from 9V to 60V with a maximum output of 12A/500W. Precise Speed Control: The motor speed can be adjusted using a fan speed control switch, offering higher precision and better consistency compared to regular potentiometers, ensuring no drift issues. High-Performance: Equipped with two high-voltage, low-resistance for MOSFETs and advanced drive circuitry, this dc motor speed regulator offers better stability and performance while supporting high voltage and power requirement. Soft Start Function: The dc motor speed controller features a soft start function, gradually increasing the current when starting without any impact, effectively protecting the motor and extending its lifespan. Excellent Material Quality: Made with high-quality materials and featuring fine craftsmanship, this variable speed controller offers excellent durability and reliability. Its compact and design makes it easy to handle and install. Motor Type: DC Motor Working voltage: DC9V-60V, input anti-reverse protection Rated current: 12AZU|High current 20A Maximum power: 500W Working frequency: 1KHZ-99KHZ adjustable, 1KHZ step, default frequency 20KHZ, accuracy about 1% Duty cycle: 0-100%, 1% step Installation opening size: 39.3MMx76.5MM (The product appearance and printed words depending on the batch, but this does not affect use) Color: As Shown Material: plastic Package Contents: 2 x PWM Fan Speed Control Switch Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.