The Reusable Safe Dehumidifier by Barska is the perfect accessory for any safe or storage compartment where moisture-sensitive items are stored. By absorbing moisture from the surrounding air, the Barska Dehumidifier helps protect valuables from mold, mildew, and corrosion. This dehumidifier is ideal for safeguarding important items that are susceptible to moisture damage, including photos, money, passports, electronics, ammunition, and countless other sensitive items. A patented color-changing humidity indicator changes the dehumidifiers color from blue or green, to pink when it is time to evaporate the moisture it has collected. This is easily done by placing the Barska Dehumidifier into a microwave for 4 minutes at 600W.