Features: *CCM5S DC Motor Speed Regulator controls the speed of a DC motor by adjusting Pulse-Width-Modulated (PWM). *Suitable for the DC motor (or DC load) within 20A. *Adjustable speed range is from 0%- . *Item size:4.14*1.97*1.3",weight:4.45oz *Input supply voltage: 9V-60VDC(max) *PWM frequency: 25kHz; Duty Cycle adjustable: 5%- *Potentiometer with adjust speed swtich function,and button swtich function. *Potentiometer cable length 0.79",Button swtich cable length:0.79". *The item with metal shell and connective label,very easy to install and use. Operating instruction: Before you attempting to wire the controller, make sure power is off. WARNING:DO NOT REVERSE POSTIVE AND NEGATIVE POWER LOADS.THIS WILL DAMAGE THE CONTROLLER. TO CHANGE MOTOR DIRECTION, INTERCHANGE THE POSITIVE AND NEGATIVE WIRES OF MOTOR. 1. Connect wires refer to the "wiring diagram" 2. Turn on the power. 3.Adjust the potentiometer. Specification: Input supply voltage range:9V-60VDC Voltage:9-60V Input current: 10A,the max.20A Adjustable speed range: 5%- Maximum Amperage:20 amps PWM frequency:25kHz Weight:4.45oz Model:CCM5S Item size: 4.14*1.97*1.3" Package Included: 1PCSCCM5S DC Motor Speed Controller with metal shell Note: 1. The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness. 2. Please allow slight manual measurement deviation for the data. _x000D_