Safe and nontoxic Eva-Dry is a natural defense against moisture and mildew in small places. Works in a 333 cu ft area and lasts 20 to 30 days before renewing. Perfect for cabinets, safes, and closets. Protects clothes and valuables from mold, mildew, and moisture. Renewable Eva-Dry dehumidifiers are filled with silica gel, a very thirsty substance. These orange odorless silica beads absorb many times their weight in moisture and lock it in so water can't leak or spill out. When the Eva-Dry is full, the beads will turn green. You renew the silica inside by plugging the unit into any power outlet. Heat gently releases water vapor in a few hours. When the indicator is orange again, Eva-Dry is renewed and ready to go back to work. You can repeat the process for up to 10 years. Reduces allergens and eliminates odors. Spill and mess-free. Absorbs humidity silently. Operates without electricity or batteries. Simply renew when indicator changes color. Uses natural silica gel crystals. Child and pet safe. Nontoxic, colorless, and odorless.