Aire Pur® Fragrance Free Moisture Absorber work by absorbing excess moisture and dripping it in liquid form into the lower container of the unit. Contains a refill with "microwoven hydrophobic technology" that holds the absorbent granules out of direct contact with hands and prevents dust spillage. Prevents problems resulting from moisture in any rooms of your home like moisture stains, mold and mildew, musty odors, condensation, oxidation, paint chipping, material aging, etc. In addition this version contains no fragrance but incorporates new Calcium Chloride formula that not only eliminates musty smells but traps strong odors with great power creating healthier, fresher and cleaner environments. It is perfect for laundry rooms, pantries, under counters, storage spaces, etc. Lasts for 1 to 3 months depending on weather conditions and humidity levels.