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.