BestTong 13KHZ PWM DC Motor Controller DC 12V-40V 10A Motors Electric Pump Fan Speed Stepless Control Module with Reverse Polarity Protection High-Current Protection Working voltage: dc 12V - dc 40V, control power: 0.01 - 400W Static Current: 0.02 A ( Standby ), PWM Duty Cycle: 10% -100% PWM frequency: 13 kHz High efficiency, small heating,widely used in the industrial production With Power supply reverse polarity protection and high current protection