The Ver-Mac SM-4815 is a solar powered skid-mounted arrowboard consisting of a 15 LED lights board respectively with Solar panel, and a battery bank.
The SM-4815 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