Eva-Dry EDV500 High Capacity Renewable Dehumidifier. Designed to adsorb moisture from small, enclosed areas. It will help protect clothes and valuables from the damaging effects of mold/mildew and moisture rot. It is 100% renewable and needs no power to operate. Just hang the Eva-dry unit in a closet, or you can place it in other small, enclosed spaces, and it will start to adsorb moisture. There are no batteries required or cords to plug in, the unit works without power. There is an indicator window with special "moisture meter crystals" that change from blue (when dry) to pink (when wet) to indicate when the unit needs to be "renewed". The unit will adsorb approximately 16-18 ounces of moisture (depending on humidity levels this should take between 6 - 8 weeks). Once the moisture has been adsorbed it cannot leak or spill.