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. Product Features Removes moisture from gun safe Interior Mounting brackets included Dries approx 200 cubic ft. Easy install quick plug attachment, 110v Protects firearm investment Guards against rust Product Specifications 18" Rod Dimensions: W 18.25" x H 1.25" x D 2.5"