Features: CCM5D DC Motor Speed Regulator controls the speed of a DC motor by adjusting Pulse-Width-Modulated (PWM). Large 0.56 inch 3-digit LED display numbers allow viewing under the most adverse conditions. Incorporate a push key. Push closed, and then push open. The display range of 3-digit LED display is 000-100. ( For example, displayed 60, it means that the PWM output duty cycle is 60% ) Specifications: Condition:brand new Input supply voltage range : 6V-30V DC PWM frequency :16kHz Adjustable speed range : 0%-100%. Suitable for : the DC motor (or DC load) within 5A, Peak current 8A. Item size: 80x40x10mm Net weight: 60g WARNING: Before you attempting to wire the controller, make sure power is off. DO NOT REVERSE POSTIVE AND NEGATIVE POWER LOADS.THIS WILLDAMAGE THE CONTROLLER. TO CHANGE MOTOR DIRECTION, INTERCHANGE THE POSITIVE AND NEGATIVE WIRES OF MOTOR. Operating instruction: 1. Connect wires refer to the wiring diagram. 2. Turn on the power, and adjust the potentiometer. 3. The LED display displays the PWM output duty cycle. 4. Push the key, the controller closed, push it again, the controller open. Package include: 1 x PWM Speed Controller