The Golden Rod Dehumidifier works by slightly increasing 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. Made in USA Removes moisture from gun safe interior Protects firearm investment Guards against rust Easy install quick plug attachment Mounting brackets included 110/120 volt AC Lifetime Warranty