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. Removes moisture from gun safe interior Mounting brackets included.Dries approx. 100 cubic ft. (12") or 200 cubic ft. (18") Easy install quick plug attachment, 110v. Protects firearm investment Guards against rust.