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.Protect firearms and other valuables from rust and corrosion.Desiccant crystals change color when canister needs recharging.Recharge canister by placing in a 300F oven until drying granules turn blue (up to 4 hours).Unlimited recharges, no batteries required.Dimensions:4″ x 5.3″ x 4.8″Desiccant:750gCALIFORNIA RESIDENTSWARNING:This product can expose you to Lead, which is know to the State of California to cause cancer, birth defects, or other reproductive harm. For more information go towww.p65warnings.ca.gov.CALIFORNIA RESIDENTSWARNING:Cancer and Reproductive Harm -www.p65warnings.ca.gov.CALIFORNIA RESIDENTSWARNING:This product can expose you to DI(2-Ethylhexyl) Phthalate, which is know to the State of California to cause cancer, birth defects, or other reproductive harm. For more information go towww.p65warnings.ca.gov.CALIFORNIA RESIDENTSWARNING:Discharging firearms in poorly ventilated areas, cleaning firearms, or handling ammunition may result in exposure to Lead, which is know to the State of California to cause birth defects, reproductive harm, and other serious physical injury. Have adequate ventilation at all times. Wash hands thoroughly after exposure. For more information go towww.p65warnings.ca.gov.