Remove moisture in any enclosed space, like your gun cabinet or safe, with Liberty's Mini-Dehumidifier. Uses colorless, odorless nontoxic water glass crystals to constantly absorb moisture from the air. Every 30-60 days, the indicator window will turn pink when the unit needs regeneration. Simply plug into a standard electrical outlet for 10-12 hours, and the indicator window will turn blue when it's recharged and ready to go again. Average life span is approximately 10 years.