The Arm & Hammer Refillable Moisture Absorber and Odor Eliminator 2 pack is your convenient solution for continuous cleaner fresher air. This musty odor eliminator works by attracting and trapping excess moisture to maintain an optimal humidity level. It works as an odor absorber, shoe deodorizer, or room freshener where moisture is an issue. To use this odor eliminator, simply remove lid, peel off foil cover, replace the lid, and place in area where excess moisture or stale odor is a problem. Once moisture absorbing crystals have fully dissolved, discard the collected water and refill. This automatic air freshener works like a dehumidifier but without electricity or batteries. Just place where there is moisture or a stale smell and watch as the odor-causing water collects inside the container. Keep out of reach of children. Read and follow all label directions.