The Ver-Mac VM-14-42L a 2 ft x 5 ft roof mounted arrow board made of molded luran plastic, containing 14 LED lights. The VM-14-42L is lightweight and can be mounted to any car, truck or van.
The SM-4825 is not affected by all normal (standard) types of RF interference
Operating 10 to 95% RH, non-condensing
Arrows displayed are easily legible at over 1600 meters (5249 feet)
From The Manufacturer