Whelen Vertex Directional LED

Only 7/8" high, this small hemispheric LED light head is perfect for most applications where size and intensity are critically important. It's a self-contained unit using an in-line combination lamp driver/flasher. This hide-away only requires a one inch hole in any composite style head light, cornering light or tail light assembly to deliver true wide angle warning to the front, side and rear of your vehicle... without interference to your vehicle computer and warning equipment. It may also be surface mounted to the outside of your vehicle!

yes i nabbed this description from the whelen website