HP on Tuesday unveiled its latest challenger to Apple's laptops, touting it as the thinnest laptop in the world. At 10.4 mm, the HP Spectre's chassis is as thin as a triple-A battery, the company noted. The Spectre is powered by Intel Core i5 and i7 processors and weighs in at 2.45 pounds. It has a 13.3-inch Gorilla glass display, and stereo speakers from Bang & Olufsen. The new line "carries some of the thin design and high-end finishing touches that HP introduced in its EliteBook Folio," said tech analyst Charles King.