The Sun Jar "collects and stores sunshine" so that you can use it at night. The Sun Jar is a glass jar with a solar-powered garden light on the inside. The idea is to have an attractive jar that "stores sunlight," and looks great with your patio furniture. No switches and less practicality, it just sits there and looks sweet.
You can opt to make one yourself for around $10-$15 or go here and buy one ready to ship for around $38.