Protect valuables from the damaging effects of moisture without the hassle of bulky, corded dehumidifiers. Eva-dry uses renewable, non-toxic silica crystals to absorb 8-10 ounces of moisture without any batteries or cords. Once the special indicator crystals show that the unit is "full" (after 4-8 weeks), simply plug into any outlet to renew. A built-in heater warms the crystals to release the moisture. The crystals will remain active for 10 years and the unit carries a 5-year warranty.