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Input supply voltage: DC 10V-55V; maximum current: 60A; continuous current: 40A; speed range: 0-100%. Potentiometer with switch function, high speed speed control which is much more adaptable DC10V-55V PWM Brushed DC Engine Speed Regulator Adjustable Driver CW CCW Reversible Switch with Dial Display Outer casing: It is designed to protect the controller board from damage and dissipate heat The input voltage must distinguish between "+", "-". The input voltage should be the rated voltage of the motor within 10-55 V, otherwise it will be burned.