No Damp Dehumidifier is the effortless way to help control the excessive humidity that leads to musty odors, stains or corrosion aboard stored boats, RVs or seasonal homes. The special crystals automatically remove moisture from the air, depositing it safely in the convenient container. Great for cabins, heads, closets, and other enclosed spaces. Features Designed to help prevent musty odors in stored boats, RVs or seasonal homes. Absorbs airborne moisture to help prevent mildew smells. Eliminates mildew odor and other musty odors. Protects boats in storage, vacation homes, basements and other enclosed areas. 12 ounce size is ideal for protecting boat cabins, closets, small rooms or safes.