It was over 25 year ago that Sound Off Signal pioneered the headlight flasher industry when they created the first widely used device to utilize your own vehicles headlights as an emergency warning device. No one else had thought of that before. The flashers are such high quality, that Sound Off sells more headlight flashers than all of our competitors COMBINED! Now 25 years later they still lead the industry not only in headlight flashers but emergency vehicle warning equipment as well. The all new positive switched general purpose headlight flasher (item number ETHFSS-SP) is a MUST have for all emergency and volunteer vehicles. During the day even the best and brightest LED lightbars can be washed out by the sun. But your headlights DO NOT! So harness your own vehicles power and make them flash. With 7 flash patterns, you can be sure that you'll find one that will suit your needs. 7 user selectable flash patterns to choose from: PowerPulse, RoadRunner, Q-Switch, ETM, Cycle Flash, Single or Double Flash. A 5 year warranty tops off the features of this MUST HAVE item. Check compatibility BEFORE ordering - Click here! Returns will not be accepted if installed on a vehicle that is not compatible with this unit.