The re-usable box has been designed for use in larger spaces such as storerooms, spare rooms and lofts. The box comes with a convenient refill pouch. Once the contents of the refill pouch have been exhausted, simply drain the moisture collected in the lower compartment and replace with a pouch. However, be careful when using next to food and other perishables, as this variant is not spill proof. Not recommended for use in closets and in proximity to perishables. Avoid placing near or on wood. Each re-usable box comes with one refill pouch, to use: simply take the plastic cover off the refill pouch and place the bag, as it is, on the top compartment of the re-usable box and place the box out of reach. Once the contents of the pouch have been exhausted, drain the water collected in the lower compartment of the box and replace with a refill pouch. Lasts up to 45 days depending on humidity conditions. Refills for reusable box are available. No fragrance.