This speed controller has a delicate and practical housing that is waterproof so you can use it outdoors Comes with screw terminal and power and motor electrode indication label for convenient wiring DC motor controller input is connected to direct current, can not be connected to alternating current, or it will be burned Make sure the positive and negative polarity are correctly connected, otherwise the controller will be damaged Suitable for 12V motors with power less than 120W, 24V motors with power less than 240W, etc. Product description Features: Potentiometer resistance: B100K Input voltage range: DC 10V-60V Output voltage: 0- of input voltage Control power: 12Vx10A=120W, 24Vx10A=240W Rated current: 10A Max Current: 20A Speed range: 5 percent - PWM frequency: 25Khz Size: 88 x 59 x 35mm or 3.46 x 2.32 x 1.38" Tap Hole Size: 8mm or 0.31" Package includes:1 x speed controller