DC 5-30V 12v 24v 5A DC Motor Controller PWM Adjustable Speed Digital.
Very nice item. It provides an accurate control of the velocity of a DC motor. It would be nice to have a small improvement : - to make that on-off incorporated switch also switches the entire regulator (turning off the display, also) and not only interrupting the motor's current. Other good idea would be having a way to place the device on a surface, instead of only intended dashboard mounting.