Details
- Built-in GPS + GLONASS
- Vibrant colour touchscreen display
- 24/7 heart rate tracking with PurePulse™
- Oxygen saturation monitoring (SpO2)
- Swimproof design | Water-resistant to 50 metres
- All-day activity tracking with 20+ goal-based exercise modes
- SmartTrack™ automatic exercise recognition
- Sleep tracking with light/deep/REM stages
- Sleep and Do Not Disturb modes
- Smartphone notifications (when phone is nearby)
- Fitbit Pay™ technology
- Fitbit® app compatibility
- Wirelessly syncs to most iOS and Android devices
- Lithium-polymer rechargeable battery
- Up to 7 day battery life (varies with use)
- Charge time (0-100%): 2 hrs
- Display dimensions: 1.04″ x 0.86″ x 0.58″
- Includes charging cable + 2 classic wristbands (small and large)
- Small fits wrists 13 – 17 cm | Large fits wrists 17 – 21 cm
- Product ID#: 25582818
- Vendor Style#: FB421GLWTFRC
Features
SMARTTRACK
SmartTrack automatically recognizes the activity that you’re doing by following the intensity and patterns of your movement. It records your workouts and captures all of your stats: like how long you were active, calories burned and heart rate zones.
PUREPULSE
Get continuous, automatic, wrist-based heart rate and simplified heart rate zones with this unique technology from Fitbit which uses sensors above your wrist to monitor blood flow.


















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