This variable speed drive has a delicate and practical housing which is waterproof so you can use it outdoors Comes with screw terminal and indication label of power and motor electrodes for wiring convenient DC motor controller input is connected to DC current, can not be connected to AC 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: 0-100% 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 Good quality product