This is the heater that attaches to any patio umbrella and evenly distributes radiant heat to everyone sitting under the canopy. Unlike tabletop heaters that only warm a limited area, this superior model's three adjoining arms combine to cast an 8' circumference of heat that warms everyone around the table. The quartz heating elements produce radiant heat that warms people and furniture surfaces--not just the air--to ensure comfortable outdoor temperatures well into the night. Folding down an arm shuts off its heating element, ensuring comfortable conditions for two people with different temperature preferences. Folding all three arms shuts off the heat, allowing the umbrella to close and ensuring safety. Since it clasps to an umbrella pole, the heater won't take up tabletop space. Plugs into AC with 8' cord. Requires a canopy measuring at least 42" in diameter. Each arm: 17 1/2" L x 4" H. (12 lbs.)