The GoldenRod Gun Saver dehumidifier can be installed in 2 minutes. It effectively eliminates humidity from the interior of your safe and protects against rust. The Gun Saver circulates slightly warm dry air throughout the safe on a continual basis. This constant circulation of air is why the GoldenRod Gun Saver works so well. The 18" size will accomodate a safe of up to 200 cubic feet. It comes with mounting brackets for easy installation. All GoldenRod dehumidifiers come with a detachable plug for easier mounting. This model features a 10' power cord and must be mounted horizontally at the bottom of an enclosure to work properly. UL listed. Limited lifetime warranty.