The Hornady Rechargeable Gun Safe Dehumidifier Can is the perfect way to protect your valuables against rust and corrosion. Canister Dehumidifier is filled with desiccant crystals designed to absorb moisture from your safe, closet, tool chest, or other enclosed area. As the desiccant crystals fill with moisture they change to a pink color. The Dehumidifier can be recharged an unlimited number of times in a standard oven.