The LOCKDOWN Dehumidifier Rods work by slightly increasing and maintaining the air temperature inside the gun safe or other enclosure. This allows the warm air to circulate throughout the safe on a continual basis, thus eliminating humidity, mildew, and condensation, all of which are dangerous to your expensive firearm collection.Specifications and Features:Removes moisture from gun safe interiorMounting brackets includedProtects firearm investmentGuards against rustDries approx. 200 cubic ftEasy install quick plug attachment, 220VDimensions: 18.25” x 1.25” x 2.5”