Note: 

This is DC motor controller, please make sure the input voltage is from DC power, do NOT connect to AC directly (such as home 220V AC), otherwise it will burn out. 

Do not reverse the positive and negative terminals of DC power supply, otherwise the governor may be damaged

The motor can be positive or negative. When the running direction is inconsistent with the expectation, the direction can be changed by adjusting the line sequence

Feature:

The DC Motor Speed Controller allows controlling direction of a DC motor using a Pulse-Width-Modulated (PWM) DC voltage with a Duty Cycle fully adjustable from 10%-100%. The motor speed controller can provide a continuous current of 8A to your DC motor or other DC load. 

Specification:
Working voltage: DC 12V - DC 40V
Control power: 0.01-400W 
Rated current :8A 
Maximum current: 10A 
Static Current:0.02 A ( Standby ) 
PWM frequency: 13kHz 
Duty Cycle adjustable: 10%-100% 
The operation environment temperature:-20℃-125℃
(L*W*H): 60 x 55 x 28mm
Net weight: 69g