The Paradigm System is one of the most advanced passive humidification device. It is designed to maintain 70% humidity at room temperature. You will need to add only distilled water every 3 months. The Paradigms sponge is anti-microbial, anti-fungal and holds 75% more water than comparable humidifiers. Made from an aluminum case with a special surgical sponge that wicks from the inside out, this product makes the green foam humidifiers obsolete! Humidifies up to 250 cigars; size 7"x 3"x 1".