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New green inventions: 15 cutting-edge items

March 23, 2010, 11:15 a.m.
New green inventions: Smart Solar Window Alarm

Photo: Smart Solar

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Smart Solar Window Alarm

Security systems can suck up a lot of energy, but this convenient alarm by Smart Solar can power itself. Equipped with solar panels, energy is stored in a lithium-ion rechargeable battery. It produces an alarm noise at 6.8 khz which should easily wake you up if triggered.