Dry-Packs 750 Gram Silica Gel Canister Dehumidifier - Moisture Indicating 750gm dehumidifier - no electric needed and Indicating silica gel - cobalt chloride free Lid Contains Orange Moisture Indicating Silica Gel For A Visual Indication Of When Unit Needs Reactivated Protect guns, ammo, sporting goods, electronics, safes, rvs, camping, coins, collections Tool boxes, safes, gun cabinets, laptop bags, closets, storage bins, shoes, boats and more Easy to reactivate for years of use