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
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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.

DOWNLOAD FLEX SIZING TOOL
SMALL
LARGE
5.5 " - 6.9 "
(140 - 176 mm)
6.3 " - 8.2 "
(161 - 209 mm)

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.

BLUETOOTH
LOW ENERGY
WIRELESS SYNC
DONGLE

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.

For a full list of supported devices, visit: http://www.fitbit.com/devices

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.

BLUETOOTH
LOW ENERGY

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.

  • CALORIES
  • DISTANCE
  • STEPS
  • SLEEP
    QUALITY

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)

Flex wristband sizing guide

SMALL
LARGE
5.5 " - 6.9 "
(140 - 176 mm)
6.3 " - 8.2 "
(161 - 209 mm)
Download the flex sizing tool to measure on your wrist

Select colour

Fitbit Flex comes in multiple colour options.

COLOUR: black
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