SoundOff Signal EGHST2A GHOST Amber Single LED Surface Mount Warning Light with Black Housing Powerful 6-generation 3 LEDs professional grade light from a very small light, SAE J595 compliant 34 different flash patterns and can be synchronized with up to three additional GHOST lights Versatile - can be used on cars, trucks, SUV's, buses, trailers in exterior or interior mounts Surface mount 4 7/8 inch center to center mounting holes 10-30 vdc multi voltage