ITEM NAME:DC 9V-50V 10A PWM Motor Speed Controller w/Knob Adjustable Speed Regulator A#S Product Description Description: Motor Speed Controllers DC 9V-50V 10A PWM Stepless Motor Speed Controller with Knob Adjustable Speed Regulator Feature: 1. Controls the speed of a DC motor with this controller. 2. High Efficiency, high torque and low heat generation. 3. With reverse polarity protection, high current protection. 4. Suitable for the DC motor (or DC load) within 10A. Specifications: Working voltage: DC 9V-50V Control power: 0.01-500W Quiescent current: 0.02A PWM duty cycle: 10%-100% PWM frequency: 13khz Size: 50*50*25mm/1.96*1.96*0.98'' (excluding potentiometer adjustment part) Note: Please allow slight size differs due to manual measurement. Due to the different display and different light, the picture may not show the actual color of the item. Thanks for your understand. Included: 1 x Motor Speed Controller 1 x Cable.PWM duty cycle: 10%-100%. PWM frequency: 13khz. Suitable for the DC motor (or DC load) within 10A. High Efficiency, high torque and low heat generation. With reverse polarity protection, high current protection.