Eva Dry E-333 Dehumidifier 5-pack 5 pack- Save in Quantity indicator window with special " color changing crystals" that change from blue (when dry) to pink (when wet) to indicate when the unit needs to be "renewed" The unit will absorb approximately 4-6 ounces of moisture (depending on humidity levels this should take approximately 3-5 weeks). Works in a 333 cubic ft area * No batteries or cords required * 100% renewable - works up to 10 years * Compact and silent * Spill and mess free * Non-toxic, child and pet safe * Eco-Friendly