Vintage Solar Flickering Flame Lanterns for Patio Umbrellas
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They have a rectangular shape with slightly rounded corners and little clips at the top to attach to the spines of your umbrella.
Two panels just under their loops need direct exposure to the sun during the day and then they can run for 4-5 hours at night.
They're 6.7 inches tall and 3.5 inches in width and depth.