Make fitness a lifestyle with Flex™.
Flex™ wireless activity and sleep wristband
This slim, stylish device is with you all the time. During the day, it tracks steps, distance, and calories burned. At night, it tracks your sleep quality and wakes you silently in the morning. Just check out the lights to see how you stack up against your personal goal. It’s the motivation you need to get out and be more active.
Here's how it works:
  • Track your activity and your sleep
    Track steps, distance, calories burned, and sleep
  • Sync your stats wirelessly
    Flex automatically syncs your stats to your computer and select smartphones
  • See real-time progress
    Get the full picture with free graphs, charts, and tools
  • Make fitness fun
    Set daily goals, earn badges, and challenge friends to get fit.
Set a goal and go
Flex allows you to set a goal and uses LED lights to show how you're stacking up. Each light represents 20% of your goal. You choose which one — steps, calories, or distance. It lights up like a scoreboard, challenging you to be more active day after day.
Flex tracks:
  • Steps taken
  • Distance traveled
  • Calories burned
  • Active minutes
  • Hours slept
  • Quality of sleep
Powered by Fitbit's leading-edge accelerometer, Flex bases calculations like calories burned on your personal profile — reflecting your stats, not any average Joe's.
Helps you get your ZZZs
Flex never sleeps, even when you do. Continue to wear it all night and it’ll measure your sleep quality. Your dashboard will reveal how long you slept and the number of times you woke up to help you learn how to sleep more soundly. Flex also has a silent wake alarm that gently vibrates to wake you at your desired time, without disturbing your partner.
At night, flex tracks:
  • How long and how well you sleep
  • How many times you wake up
In the morning, it:
  • Wakes you with a silent alarm
  • won't bother your partner
Always by your side
Flex is your perfect companion. It fits comfortably around your wrist so you can wear it proudly all day and night.
  • Easy to wear
  • Water-resistant
  • With you all the time
  • Reminds you to keep moving
Sync your stats. See your progress
Flex automatically syncs your data to PCs, Macs, many iOS devices and select Android phones without plugging in or pushing buttons. This gives you real-time access to your stats on the Fitbit dashboard throughout the day. Also with select NFC-enabled Android devices, you can tap your device to launch your Fitbit stats. It's like magic.
Discover your trends
Flex comes with free online tools and a mobile app that allow you to set goals and follow your progress through awesome graphs and charts.
Log food, workouts and much more and get the inside scoop on your health. Knowing how close you are to reaching your goals gives you the motivation to reach them and aim higher.
Make the most of workouts with MobileRun
Track runs & hikes
Use GPS from your phone to track key run and hike stats like pace, time, splits and distance.
Map routes
View your routes and mile markers as you move, then scroll through your run history and route maps.
Record workouts
Log workouts in seconds and see them appear instantly on your monthly exercise calendar.
Voice cues & music control
Get on-the-go pace and distance stats with voice cues, and control your music right from the app.
Available on iOS only. Android coming soon.
Flexibility to match your style
Flex tracker is flexible. You can take this tiny tracker out and put into any of Flex's colourful bands to fit your mood. Check out our accessory band colours and look good no matter what you're wearing.
Plays well with other apps
Weight trends can be influenced by a variety of fitness and nutrition factors. Fitbit works with several popular health apps that let you export your Fitbit data their way. Some, like Lose It!, also let you import their data into your Fitbit dashboard, so you can track your stats in either location.
What’s included
  • Flex™ tracker
  • Large & small wristbands
  • Wireless sync dongle
  • Charging cable
  • Free Fitbit.com membership - includes ability to log and track activity, food, sleep, water, body mass, weight, and more
  • Access to free mobile apps for iPhone and Android
Colours
Flex wristbands and accessory bands come in many fun colours:
  • Black
  • Slate
  • Tangerine
  • Teal
  • Navy
  • Violet
  • Blue
  • Lime
  • Pink
  • Red
Controls & Display
Flex uses five white LED indicator lights to show you how your day is stacking up against your goals. Each light represents 20% of your goal. Just tap the display twice to see your progress against your daily goal.
Sizing
SMALL* 5.5 - 6.9 inches (140 - 176 mm)
LARGE* 6.3 - 8.2 inches (161 - 209 mm)
WIDTH 0.6 inches (13.99 mm)
*Fitbit Flex is sold with both a small and large wristband.
Wireless sync to PC and Mac
Fitbit's trackers are the first all day activity trackers to offer Bluetooth Low Energy connectivity, so you see your stats in real-time.

Syncing occurs automatically any time Flex is within about 20 feet of the wireless sync dongle and is relatively motionless. The dongle plugs into your Mac or PC's USB port. Syncing and uploading require use of the Fitbit Connect application.
Wireless sync to mobile
Syncing Flex™ to your smartphone or tablet requires Bluetooth Low Energy. This allows your Flex to sync wirelessly and automatically with a wide range of leading iOS and Android Smartphones.

If your phone does not support Bluetooth Low Energy, you're still in luck. The Fitbit mobile app works with all smartphones for logging data, receiving notifications, and viewing graphs and charts based on your last sync.
Memory
We recommend syncing your data regularly. As long as Flex has battery power, it tracks the most recent seven days of detailed, minute-by-minute data. It also tracks your daily total for the past 30 days and summarizes your daily calories, distance, and steps taken.
Batteries & Power
Flex battery lasts approximately five days when fully charged. When charging your Flex the LED lights will indicate its level of charge. All 5 lights will light up when it's fully charged. You can also see your battery level on your Dashboard and mobile application. Remember to charge your Flex every 3 to 5 days to ensure you are always tracking.
BATTERY LIFE 5 days
BATTERY TYPE Lithium-polymer
RADIO TRANSCEIVER
(FOR WIRELESS SYNC)		 Bluetooth 4.0
Browsers supported
  PC BROWSERS MAC BROWSERS
CHROME 12 and up 12 and up
FIREFOX 3.6.18 and up 3.6.18 and up
INTERNET EXPLORER 8 and up ---
SAFARI --- 5.0.5 and up
PC & Mac requirements
  • Windows XP/Vista/7/8
  • USB port
  • Internet connection
  • Mac OS X 10.5 and up
  • USB port
  • Internet connection
Sensors & Motors
Flex uses a MEMS 3-axis accelerometer that measures your motion patterns to determine your calories burned, distance traveled, steps taken, and sleep quality. Flex also contains a vibration motor, which allows it to vibrate when alarms are set to go off.
Environmental requirements
Flex™ is water resistant. It should be able to brave all the elements of your everyday life ­- whether you're in the shower or out in the rain.
OPERATING TEMPERATURE -4° to 113° F
(-20° to 45° C)
NON-OPERATING TEMPERATURE -22° to 140° F
(-30° to 60° C)
WATER RESISTANT Device is water resistant, and can be submerged up to 10 meters.
MAXIMUM OPERATING ALTITUDE 30,000 feet (9,144 m)
Certification and Compliance
Compliant with the standard R&TTE 1999-CE05.
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