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4. The rotary potentiometer can adjust the starting speed. 3. The rotary potentiometer has a switch for easy and stop. 1. The PWM frequency is 25KHZ, which can adapt to most 12V adjustable speed fans on the market. 2. The duty cycle can be adjusted from 0% to 97%, with a wide speed range. 5. Short-circuit the PF pad to reverse the duty cycle