Safe, inexpensive and effective way to fight mildew, mold, condensation and corrosion. 24 hours a day safety. Safe to touch, around fabrics, for all marine use. No devices to case sparking. Constant ON-low operating cost. 110/120V current. Uses natural convection to circulate air. Trouble free operation. Cool, damp air is drawn through the bottom base, heated and then release through the top perforated surface. Neutral Beige color. Listed by Underwriters Laboratories. Model 500 stock # 5501043: Enclosed spaces up to 500 cu ft 70 watts, .6 amps. Model 1100 Stock # 5501193: Enclosed spaces up to 1000 cu ft 130 watts, 1.1 amps.