Features: This motor speed controller comes with a on/offs button and can be controlled externally, making it convenient for customers to use. With soft starting function, this PWM controller ensures smooth start-up of the motor without any impact current, effectively protecting the motor and extending its service life. Suitable for those who need to control the speed of their motor, such as DIY enthusiasts,and electricians. This LED dimming modules are perfect for various applications, including fan speed control, light dimming, and motor speed regulation. The digital encoders knob provides highers accuracy and consistency when adjusting the motor speed compared to traditional potentiometers. Specifications: Working voltage:5V~30V, input anti-reverse connection protections. Current: 5A Maximums current: 15A Maximums power: 150W Material:Plastic Size:As Picture Shows Quantity:1pc Package Includes: 1x Controller note: Please allow a little error on the size due to manual measurement. The color might exist slightly difference due to different displays.