Protect your valuables against rust and corrosion. When the moisture control crystals turn pink, recharge unit by placing it in the oven. Unlimited recharges ensure a lifetime of use. Hornady Silica Gel Dehumidifier Canister - protect your firearms, gun accessories, ammo and more from excess moisture, rust, and corrosion by keeping these reusable gun safe dehumidifier cans handy Keep Your Gun Safe Moisture and Rust-Free - portable dehumidifier with highly absorbent silica gel to attract excess humidity from its surroundings. This Hornady dehumidifier is crucial in maintaining the overall condition and shape of your guns Compact, Easy to Use - ready to use gun safe dehumidifiers with no batteries or electrical equipment required. It easily recharges in a warm oven for infinite reuse. Measures: 4 inches H x 5.3 inches W x 4.8 inches D Desiccant: 750g Effective Volume: 50 cubic feet Humidity Indicator - ideal moisture absorbers for safes with desiccant crystals that change from blue to pink when it's time to recharge each desiccant dehumidifier unit. Simply recharge each canister by placing it in a 300-degree F oven until silica gel canister turns blue (up to 4 hours) Gun Safe Accessories for Your Lifestyle - further protect and preserve your firearms as they are being stored with this efficient Hornady Safe storage dehumidifier. Optimal for all of your small spaces including gun safes, gun locker, rifle safe, hard case, gun bag, closets, cabinets, cars, RVs, boats, and more