The fitbit is a thumb sized device worn on the belt. It uses an accelerometer, and proprietary algorithms to give the wearer a rough estimate of his or her activity level and the number of calories burned during a day. The device can also be worn around the wrist during at night to give a rough estimate of sleep onset and duration.
The fitbit’s core sensor is similar to a pedometer, but sophisticated onboard analysis and wireless upload capabilities transform a limited tool into one that is almost effortless to use; data is uploaded to the user’s computer whenever it is nearby. Fitbit also keeps users engaged by inviting them to share their information online. They can track can track their weight, sleep and activity over the long term, searching for trends and competing with friends to be the most active or the best sleeper.
Credit: Winnie Wintermeyer