The FA and FS series flashers have proven their reliability through years of use on communication towers, smoke stacks, cooling towers, tall buildings, bridges and utility towers. The highest quality components are encapsulated in a rugged plastic housing with a molded-in heat transfer plate. The flash rate, ratio and fail safe design meet FAA regulations. Zero voltage switching can increase lamp life up to ten times. The FS155-30RF and FS165-30RF include superior RF filtering circuitry for use in high RF installations, including AM hot towers.