Jawbone Up detailed: tracks activity, food intake and sleep cycles, available November 6 for $100

Engadget - Back in July, Jawbone did something puzzling. The company, best known for its Bluetooth headsets, teased a photo of a colorful wristband called the Up -- a deceptively simple thing that could purportedly track your eating, sleeping and exercise habits. The outfit left out a few teensy details: the price, shipping date and, the biggest riddle of all, how it works.

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