While a battery-shaped indicator lights up to show remaining battery capacity, the mile range indicator fluctuates wildly as it constantly projects how far you can go if you continue on your present course.

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Zhu was wearing a recently purchased Eiffel Tower baseball cap with blinking battery-powered lights.

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Still, we really liked a lot of the ideas and chose to focus on projects that could be done quickly, such as placing battery-operated lights in jars or vases in the windows instead of faux candles and filling clear-glass ornaments with confetti to hang on white tabletop trees as part of the dining-room-table centerpiece.

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Steven Burt, G24's chief financial officer, talks of light-bulb-powered TV remote controls, smoke detectors and computer keyboards. (A non-removable internal battery would store charge for use when the lights are off.) The company already offers prototypes of bags and jackets with photosensitive panels woven in, designed to charge digital cameras and mobile phones, and a hotel in Las Vegas is using G24's products to run its electric window-blinds.

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The electricity generated by a micro-wind turbine is transmitted and stored in a battery before being used to drive home electrical appliances such as lights, LCD monitors and TV sets.

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The first socket is used to charge the lithium-ion battery and the second can be used to connect electrical devices such as coolers or camping lights.

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