Fitbit Flex

Fitbit Flex

  • Water Resistance: Sweat, rain and splash proof. However, the device does not support swimming. We also recommend taking Charge off before showering because, as with any wearable device, it’s best for your skin if the band stays dry and clean.
  • We recommend charging your device every few days to ensure you are always tracking. Charge time: One to two hours. Battery life: up to 7 – 10 days. Battery type: Lithium-polymer
  • Syncs with Windows Vista and later, Mac OS X 10.6 and up, iPhone 4S and later, iPad 3 gen. and later, and leading Android and Windows devices

All-Day Activity

Track steps, distance, calories burned, active minutes, hourly activity and stationary time.

Interchangeable Accessories

Style Flex your way with accessories from Fitbit and Tory Burch.


Progress Display

See LEDs light up as you progress toward your daily goal.

Long Battery Life

Battery life up to 5 days so you can track all day and night without needing a charge.*

*Battery life and charge cycles vary with use, settings, and other factors; actual results will vary. Smartphone notifications unavailable on Windows devices.


Auto Sleep Tracking & Silent Alarms

Automatically track your sleep quality & wake up peacefully with a silent alarm.

Wireless Syncing

Sync stats wirelessly & automatically to computers and 200+ leading iOS, Android and Windows devices.

Sensors & Components

3-axis accelerometer and Vibration motor

Battery type


Charge time

One to two hours

Radio transceiver

Bluetooth 4.0

Maximum operating altitude

9,144 m