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Its a PWM speed controller which enables you to control the speed of those DC brush motors smoothly. Its ideal for applications like car motors DC heater bulb etc. providing nice adjustment of motor speed.

Features:
Wide voltage range 10-50V 40A max. 2000W for motor speed control & HHO.
Apply PWM Modulation system to adjust motor speed from 5-100% .
Stable in working high efficiency and low noise.
Field-effect tube drive IC 70μm sheet PCB for higher efficiency of PWM wave output.
Potentiometer for speed adjustment protective case creates better durability.
Specific Power Control:
12V: 480W; 24V: 960W; 36V: 1440W；40V: 1600W; 50V: 2000W
PWM Working Principle:
BY changing the duty ratio of square wave(output) to adjust average current power from 0-100% on load thus to change the motor speed or light brightness.
Main Applications:
1.Universal DC brush motor speed control.
2.Control motor speed of cars(eg. car cooling fan motor car fan motor car windshield wiper motor air condition fan motor)
3.Adjust speed of the conveyor of product lines tube exhaust fan treadmill electric fan.
4.Adjust temperature of DC heater brightness of common DC bulb. 

Specifications:
Type: Potentiometer(1) / Potentiometer with External Wire to connect(2) (Optional)
Working Voltage: DC 10-50V
Control Power: 0.01-2000W
Rated Current: 40A
Quiescent Current: 0.025A
PWM Duty Ratio: 5-100%
PWM Frequency: 12khz
Working Temperature: -20 to 40℃
Item Size: 10 * 5 * 2.7cm / 3.94 * 1.97 * 1.06in (Type 1)
Item Size: 9 * 5 * 2.5cm / 3.54 * 1.97 * 0.98in (Type 2)
Wire Length: 18.5cm / 7.28in (Type 2)
Item Weight: 92g / 3.25oz(Type 1)   97g / 3.42oz(Type 2)  (Without Cover）
Package Size: 10.3 * 5.3 * 3.5cm / 4.06 * 2.09 * 1.38in
Package Weight: 139g / 4.9oz(Type 1)   142.5g / 5.03oz(Type 2) 

Package List:
1 * DC Motor Speed Controller
User Manual Website:
https://www.dropbox.com/s/mf08lrkbuxt9zd0/E1216.docx?dl=0