Davis Instruments Air-Dryr 500. It uses the energy equivalent to a 100-watt light bulb to draw cool moist air into the bottom of the unit which is then heated and released from the top of the unit and allowed to circulate. This convection encourages moisture to be held in suspension where it can be released by ventilating it outdoors. It is great for use in boats RVs planes cabins and vacation homes and excellent for winter storage too. Completely silent with a thermal cut-off for added safety should the top become obstructed. A single Air-Dryr 1000 is recommended for spaces 1000 cubic feet and smaller. Specifications for Davis Instruments Air-Dryr: Manufacturer: Davis Instruments Color: Tan Features of Davis Instruments Air-Dryr: Safe quiet operation Uses very little current Features thermal cut-off switch for safety Designed to operate 24 hours a day Use in RVs boats vacation homes cabins basements Neutral beige polycarbonate housing for strength and durability Promotes air circulation Package Contents: Davis Instruments Air-Dryr Davis Instruments 1459: Air-Dryr 500