The Fitbit Tracker uses a three-dimensional accelerometer, similar to that in the Wii Remote, to sense user movement. Like many pedeometers, the Tracker measures steps taken, distance walked, calories burned, and activity duration and intensity. It uses an OLED display to display this and other information such as the battery level. It also measures sleep quality: how long it takes the wearer to fall asleep, how often they wake up over the course of the night, and for how long they are actually asleep.
Fitbit Buy
A wireless base station is included to receive data from the Tracker and also charge its battery. When connected to a computer the base station will upload data to the Fitbit website (which is required for use). From the website, a number of features are possible: seeing an overview of physical activity, setting and tracking goals, keeping food and activity logs, and interacting with friends. Use of the website will be free, though James Park has indicated there are plans to add premium subscriptions in the future.
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