Covers up to approx. a 2500 sq. ft. house. Powered by a 120 AC outlet (comes with 40 feet of cord). Can be used to protect a house or a small area. Designed to operate outdoors and reduce energy fields from TVs, microwave ovens, and other electrical appliances including fluorescent lights. Works on both AC and DC issues. Must operate 24 hours a day to provide maximize protection. Approx. 16 inches tall, 10 inches wide, and 14 inches long.