Absorb humidity and prevent rust or mildew in gun safes or other enclosed areas. Moisture-control crystals change color when unit needs recharging. Recharge by plugging into 110V electrical outlet. Features: - Safeguards firearms and other valuables from mold and mildew - Eliminates humidity in enclosed spaces up to 333 cubic feet - Quick-connect bracket makes mounting unit easy in gun safes closets or pantries - Removes humidity without electricity or batteries - Color-shifting moisture-control crystals signal when recharging is necessary - Simply plug in to dry out crystals and recharge unit for renewed effectiveness - Contains no harmful chemicals — child pet and home safe Specifications: - Height: 1.5 - Length: 6 - Width: 4.1 - Coverage: 333 Cubic Feet - Shipping Weight: 2.00 lbs. - DOT- Regulated: Yes.