Features Using PWM speed control technology, high conversion efficiency, large speed control range, stable performance. Imported semiconductor chips are used and tested for voltage, current, function, etc., the circuit is stable and reliable. Wide speed range from 5% to 95%, PWM frequency 500Hz, potentiometer resistance value B10K. Safe to use, with overload and short circuit protection to protect the motor from damage and extend the life of the motor. Potentiometers can be used to accelerate the positive and negative switches for forward, reverse and stop. Specification: Item Type:DC Motor Speed Controller Material: PCB Purpose: To adjust the DC motor speed Model: CCM2. Operating voltage: DC10V-30V. Control power: 12V x 3A = 36W, 24V x 3A = 72W, more than 24A, maximum 120W. Rated current: 3A. Maximum current: 4A. Speed adjustment range: 5%-95% PWM Frequency: 500Hz Potentiometer: resistance value B10K. Cable length: approx. 20 cm / 7.9 inches. Output voltage: about 0-100% of input voltage Product size: approx. 74 x 47 x 28 mm / 2.9 x 1.9 x 1.1 inches. Package List: 1 x DC Motor Speed Controller 1 x switch, 1 x button, 1 x nut, 1 x washer Note: 1. The input of the DC motor speed controller is DC and cannot be directly connected to AC current (e.g. B. 220 V AC motor for the household), otherwise it will burn out. 2. The positive and negative poles of the DC supply cannot be interchanged, otherwise the regulator will be damaged.3. The motor can be positive or negative. If the running direction does not match the expectation, the direction can be changed by adjusting the wire sequence.4. The potentiometer knob can change the duty cycle of the regulator output and thus the motor speed. Package List 1 x DC Motor Speed Controller 1 x Switch 1 x Knob 1 x Nut 1 x Washer