This speed controller has a delicate and practical housing that is waterproof so you can use it outdoors. Comes with screw terminal and a label indicating the power and motor electrodes for convenient wiring. The input of the DC motor controller is connected to DC power, cannot be connected to AC power, or it will be burned. Make sure the positive and negative polarity are connected correctly, otherwise the controller will be damaged. Suitable for 12V motors with a power less than 120W, 24V motors with a power less than 240W, etc. Product Description Features: Potentiometer Resistance: B100K Input Voltage Range: DC 10V-60V Output Voltage: 0-100% of Input Voltage Control Power: 12V*10A=120W, 24V*10A=240W Rated Current: 10A Max Current: 20A Speed Range: 5%-100% PWM Frequency: 25Khz Size: 88 x 59 x 40mm / 3.46 x 2.32 x 1.57" Tap Hole Size: 8mm / 0.31" Package Includes: 1 x Speed Controller