Laughing, walking up stairs, opening a bottle of wine — they're all activities that burn calories, and with the , you can track just how many calories, along with how many steps you take in a day, and how many hours of sleep you get at night. The sensor uses technology similar to that found in Nintendo's Wii to track your motions and can record minutes details like how long it took you to fall asleep, and how many times you woke up during the night. For things like how many calories you consume, or calories burned doing activities like biking, the Fitbit web site has ways to help you track that, too.
— Lisa Lombardi