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Never be left with a dead battery with the Powerocks Magic Cube and Stone3 portable power bank products, which will be introduced next week at the Consumer Electronics Show in Las Vegas, Nevada. Magic Cube and Stone3 are light-weight, portable back-up power chargers for smartphones and tablets, e-readers, MP3 players, GPS devices, LED lights, digital cameras and other devices. The Stone3, shown below, can even power your iPad and iPhone (or two iPhones) at the same time. Priced from $74.99 to $109.99 the Powerocks Magic Cube and Stone3 portable power products will be in the Powerocks booth, Booth #5438, North Hall, at the Las Vegas Convention Center.