? Description: This is a simple and easy-to-use DC motor speed controller of small size, elegant appearance and stable performance. It is made with high quality circuit board which ensures a longer service life. Packing with an antistatic bag, you dont have to worry about damage of static during transportation. Features: Well made with high quality circuit board, long service life. Simple and easy-to-use DC motor speed controller. Small size and elegant appearance. Performance is very stable. The imum current up to 20A, heat sink and fan are required. Packed in an antistatic bag to protect it from damage of static during transportation. Specifications: Voltage: DC10-60V Output Current: 20A(10A, less than 450W suggested if continuous use, enhance heat dissipation) Power: 1200W Speed Regulation Type: Current adjustment Speed Regulation Mode: Potentiometer (linear) Speed Regulation Duty Cycle Range: 0--100% Control Frequency: 25KHZ Wiring Methods: Barrier strip screw terminals Knob Wire Length: 20cm / 7.87 Size: 7.6 x 4.4 x 2.7cm / 2.99 x 1.73 x 1.06" Weight: 77g(approx.) Package Includes: 1 x Speed Regulator Note: 1. Make sure the positive and negative polarity is connected correctly. 2. Wiring should not touch heat sinks, or it will probably burn circuit board.This is not a power module. Only if the module is connected to motor first then it can control speed. 3 . Please allow 1-3mm error due to manual measurement. Thanks for your understanding. 4. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.