Intended for use inside enclosed gun safes and cabinets, the Rechargeable Dehumidifier, by Hornady Security, is equally suited to eliminating humidity and preventing mold and mildew inside closets and pantries. Internal moisture-absorbing crystals change colors as they work, and a window in the front of the unit lets you see when they need to be recharged. When needed, simply plug the dehumidifier into any standard 110-volt electrical outlet to dry out the crystals for renewed effectiveness. An included bracket allows the $20 system to be easily mounted to a flat surface. For more information, please visit hornady.com.