Once enabled by a brake pedal switch, Solid State controllers apply a gradual voltage to the trailer's brakes by means of a Time Delay Circuit. The nice thing about a Time Delayed controller is that it doesn't cost much, has a low profile, and can be mounted easily on any angle. On the con side, when you are towing with your Hazard flashers on, the Digital Display will flash in unison with the Hazard Flashers. If the Brake Control is set too high, you may feel a little pulsing in the trailer brakes. But not to worry, the Pulse Preventer can rectify this situation by isolating the Brake Control from the flashers.