Features Speed control knob: Adjustable DC motor speed controller is equipped with an external speed control knob, forward and reverse control, (forward and stop) PWM speed regulation has a forward and reverse switch Monolithic capacitor: DC motor speed controller adopts high-quality chip, filter capacitor adopts monolithic capacitor, the circuit is stable and reliable Double the radiator area: The radiator area used by the speed controller reversing switch is more than twice that of similar products in the market, which can meet the needs of 60W-150W motors. PWM speed regulation technology: DC brush motor controller adopts PWM speed regulation technology, which has the characteristics of high conversion efficiency, wide speed regulation range and stable performance. Semiconductor chips: PWM speed regulation uses all imported semiconductor chips from STMicroelectronics. The voltage, current, and function tests are performed before leaving the factory, and the circuit is stable and reliable Feature: The products are equipped with external speed control knobs. Positive and negative control, (positive stop) products are equipped with positive and negative switches. Using high-quality chips, the filter capacitor uses monolithic capacitors, and the circuit is stable and reliable. The heat sink area used by this governor is more than twice that of similar products on the market, and can meet the needs of 60W-150W motors. The controller uses PWM speed control technology, which has the characteristics of high conversion efficiency, wide speed range and stable performance. The controller uses all imported original semiconductor chips from STMicroelectronics. It is tested by voltage, current and function before leaving the factory. The circuit is stable and reliable. Specification: Input Voltage: 5V-30V DC (Wide Range) Maximum output power: 150W Maximum continuous current 6A PWM Pulse Width Modulation Range: 0%-100% Size: 73.5*45.5*27mm / 2.9*1.8*1.1in(length * width * height) Installation hole center distance: 63.5*36.5mm / 2.5*1.4in Location hole diameter: 3.5mm Weight: 69g / 2.4oz Package list: 1 * Adjustable DC Motor Speed Controller Note: The actual product color may deviate from the photo due to light. There may be a slight deviation in the measurement of product.Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering. Package List