Click on the following link for product video demo presentation. https://youtu.be/9XZIe39Y__s

1500W CCM6DS 12V 24V 36V 50V 30A(max) DC Motor Speed Controller Adjustable Speed Governor PWM
Features:

CCM6DS 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):12V,250W below;24V,350W below,36V,500W below.
Adjustable speed range is from 0%-100%. 
Potentiometer with switch function.
Incorporate a 30A fuse, and with the protection function of reverse connect power supply.
Potentiometer cable length 20cm.
Equipped with aluminum shell and connection label, installed easily.

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” (NO.5 picture).
(It is recommended to add an appropriately rated fuse inline with the positive supply.)
2. Turn on the power.
3.Adjust the potentiometer.