Safe And Nontoxic, Eva-Dry Is A Natural Defense Against Moisture And Mildew InLarger Places. Fight Dampness In Boats, Safes, Rv’ S, And Big Closets. WorksIn 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 ThirstySubstance. These Orange Odorless Silica Beads Absorb Many Times Their WeightIn Moisture And Lock It In So Water Can’t Leak Or Spill Out. When The Eva-DryIs Full, The Beads Will Turn Green. You Renew The Silica Inside By PluggingThe Unit Into Any Power Outlet. Heat Gently Releases Water Vapor In A FewHours. When The Indicator Is Orange Again, Eva-Dry Is Renewed And Ready To GoBack To Work. You Can Repeat The Process For Up To 10 Years. Reduces AllergensAnd Eliminates Odors. Spill And Mess-Free. Absorbs Humidity Silently. OperatesWithout Electricity Or Batteries. Simply Renew When Indicator Changes Color.Uses Natural Silica Gel Crystals. Child And Pet Safe. Nontoxic, Colorless, AndOdorless.