The Genus Specta Fly Light is a plug in unit. Please let is know if we can be of any further assistance.
The Genus Spectra Fly Light could be used in the barn to help with fly control but you want to be sure you are limiting competing light sources so they are more interested in it. For barns, generally the best products are fly traps (such as ribbons or the tape) or fly baits are best.
The Genus Spectra Fly Light can be installed vertically, horizontally or in corners. The most common pest fly species tend to fly at a height between 3 and 6 feet above the ground. Installing insect light traps in or near this height range maximizes their speed of catch under most conditions, and improves capture efficiency. You also want to be sure that it is not placed where it could be moved or knocked over.