Eva-Dry 500 Cu Ft Renewable Mini Dehumidifier Safe and nontoxic, Eva-Dry is a natural defense against moisture and mildew in larger places. Fight dampness in boats, safes, RV's, and big closets. Works in a 500 cu ft area and lasts approximately 30 to 60 days before renewing. 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. Coverage 500 cu ft, Duration 30 to 60 Days, Dimensions 2-1/2 W x 5-1/2 H x 8 L, Pkg Qty 1, Package Type Clamshell