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Fitbit, creator of a wearable device that tracks your daily activity, has raised $8 million in a second round of funding. True Ventures and Foundry Group participated in the round, according to a filing with the SEC.

The Fitbit Tracker monitors distance traveled and calories burned throughout the day, and the sensor wirelessly syncs with computers when within 15 feet of the included base station. The device, which can be clipped onto clothing or carried in a pocket, also tracks sleep patterns during the night.

Though Fitbit sold a few Trackers last fall, the company missed the holiday season in December due to problems with manufacturing and testing. Users can currently place orders for the device on the Fitbit Web site, but according to the site, orders placed now will not ship until the end of the month due to high demand. Based in San Francisco, Fitbit previously raised $2 million in 2008.

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