This PWM controller will allow you to control the speed of DC motors up to 3A, it also has a switch to reverse the polarity of the motor, you can also control high-power LEDs or Peltier cells without problems. A PWM regulator works from the variation of the frequency of a voltage signal, thus allowing the load to interpret a lower voltage signal. This effect can be used to control the speed of DC motors or loads that require power regulation such as Peltier cells.
When changing polarity to a motor it is necessary to wait for the motor to stop as the reverse current from the motor can damage the controller.