Description: Display PWM duty cycle or represent brightness value or motor speed value0-100%. If the minimum value is set to 20, the maximum value is set to 80. and the display value of 000-100 represents the duty cycle of 20%-80%. The frequency value is adjustable from 1Hz to 150KHz. Press down the knob: short press to turn PWM output on or off. Press and hold for 2 seconds to automatically switch anda djust the frequency Or duty cycle. Long press for more than 8 seconds to enter the setting inter faceau to matically. If your PWM signal input resistance is infinite, the PWM amplitude is approximately equal to the modulesupply voltage; If your signal input resistanceIs 1kΩ. Then the PWM signal amplitude is1/2 of the input voltage of your module. In a word, the smaller the resistance of your signal input or the greater the load power of PWM, the smaller the amplitude of PWM signal will become. Specification: Material: Plastic Size Chart: 79x43x26mm/3.11x1.69x1.02inch Package Includes: 1x PWM Pulse Generator Note: 1. Please allow slightly error due to manual measurement. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. 3. Wish you a wonderful on-line shopping!