NanoTech-Electronics

The simple pedometer has been given a makeover. Fitbit, a startup based in San Francisco, has built a small, unobtrusive sensor that tracks a person's movement 24 hours a day to produce a record of her steps taken, her calories burned, and even the quality of her sleep. Data is wirelessly uploaded to the Web so that users can monitor their activity and compare it with that of their friends.

James Park, cofounder of Fitbit, says that one of the main goals was to make the sensor so small that it will go unnoticed no matter what a person is wearing. The device can be put in a pocket, attached discretely to a bra, or slipped into a special wristband during sleep. It is meant to be worn 24-7, and each device can run for 10 days on a single battery charge. Park demonstrated the Fitbit device in San Francisco on Tuesday at the Techcrunch50 conference, a popular launch pad for new technology companies.

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