Safe inexpensive & effective way to fight mildew mold condensation & corrosion. 24-hr. safety. Safe to touch around fabrics for all marine use. No devices to cause sparking. Constant ON-low operating cost. 110/120V current. Natural convection circulates air. Trouble-free operation. Cool damp air is drawn through bottom base heated & released through top perforated surface. Neutral Beige color. Listed by Underwriters Laboratories. Model 500 - Enclosed spaces up to 500 cu. ft. 70 watts .6 amps. Model 1000 - Enclosed spaces up to 1000 cu. ft. 130 watts 1.1 amps.