GoldenRod eliminates dampness, mildew, condensation and humidity. Installed in minutes, safe from fire danger and costing only pennies a day, GoldenRod will amaze you with its power to protect boats, RV"s and guns. Plug in a GoldenRod and damaging dampness disappears...for good. How GoldenRod works: GoldenRod heats to a surface temperature of less than 150F (which is almost too warm to hold for some) and circulates warm, dry air throughout an enclosure on a 24-hour basis. This increases the temperature of the air inside to several degrees above the ambient outside temperature. Expansion of the heated air forces the moist air outside through the vents or loose fitting doors leaving the dry air inside. GoldenRod is energy efficient and easy to install. GoldenRod is UL listed and made in the U.S.A., and guaranteed for ten years. Approximate coverage: 200 Cubic feet.The plug is detachable so threading your cord through the small dehumidifier hole in your safe is easy.