Eliminate damaging humidity, mildew, and condensation from your gun safe, vault, or closet with the Lockdown 18" Dehumidifier Rod. Works by slightly increasing and maintaining the air temperature inside a small enclosure, allowing warm air to circulate throughout the safe on a continual basis. A single 18" rod dries up to 200 cu.ft. of space. Easy-to-install 110V quick plug attachment and mounting brackets included.