The Fitbit Flex is a digital wristband that tracks the wearer’s daily steps and monitors sleep quality. The device wirelessly syncs with computers and smartphones to provide data and analysis about the user's sleep and exercise habits. The device is water-resistant and has a five-day battery life.
An internal accelerometer tracks the wearer’s steps, and light-emitting diodes on the wristband light up to indicate how close the user is to 10,000 daily steps, with each LED representing 20 percent of the daily goal. Users can sync this data with a smartphone app or at Fitbit.com to track past steps, set goals, and view estimates on how many calories they have burned and the distance they have travelled.
Users can log meals using the website or app to track calorie intake. The site allows users to select from foods in the Fitbit database or create their own custom foods. Users can also enter their weights or sync them wirelessly from the Fitbit Aria body scale to track calorie-intake, weight-loss and exercise goals through the device and app.
The Flex also tracks the wearer’s motion to determine how long it takes to fall asleep and how often the user wakes at night. This information is also synced to the app or website, and users can view the data by day, week, month or year.