The Golden Rod Dehumidifier works by slightly increasing the air temperature inside the gun safe or enclosure. This allows the warm air to circulate throughout the safe, eliminating dangerous humidity, mildew, and condensation that can ruin your expensive firearms. Made in the USA. Protects up to 200 cubic feet Eliminates excess moisture by continuously warming and circulating the air Ideal for gun safes, boat hulls, campers, and more Vermiculite filled Backed by a manufacturer's lifetime warranty Made in USA Order today!