Fitbit Sense 2 Graphite/Graphite FB521BKGB
FB521BKGB
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Pay in 4 interest-free payments of $109.25
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Key Features
- 6+ days battery life with fast charge means less charging, more tracking.
- Stress management tools, including cEDA sensor for real-time body-response tracking.
- Track key health metrics like blood oxygen (SpO2) and heart rate variability.
- ECG app monitors for atrial fibrillation, a heart rhythm irregularity.
- Personalised Sleep Profile and Sleep Score help you understand and improve rest.
- On-wrist Bluetooth calls and text notifications when your phone is nearby.
Fitbit Sense 2 Smart Watch, Graphite/Graphite FB521BKGB
Meet Sense 2—the smartwatch designed to help you stress less, sleep better & live healthier. Plus, continuous tracking of your heart & activity lets you track your overall wellness. Get on-the-go assistance with Google Wallet & Maps3, and dive deep into your health & fitness with the included 6-month Premium membership.4
- • 6+ Days Battery Life with Fast Charge
- • iOS and Android™ Compatible
- • EDA Scan & ECG App
- • Active Zone Minutes
- • Daily Readiness Score Premium
- • Bluetooth® Calls & Text Notifications
- • Built-in Amazon Alexa Voice Assistant
- • Stress Management Score
- • High & Low Heart Rate Notifications
- • Reminders to Reflect Smart Notifications
KEY FEATURES:
THIN, LIGHTWEIGHT & COMFORTABLE DESIGN
Stay comfortable all day, during workouts, sleep and more with a thin, lightweight design that sits more naturally on the wrist.
WATCH YOUR WELL-BEING
Track key health metrics like blood oxygen (SpO2)5 & heart rate variability to help illuminate changes in your wellness so you can adjust your routine to better support your health. Check your heart rhythm on demand for atrial fibrillation, a heart rhythm irregularity, with the compatible ECG app.6
ALL-DAY BODY-RESPONSE TRACKING
Using a cEDA sensor, identify signs of stress, excitement, caffeine and more. Identify your triggers and take action to manage your stress in the moment.7 Get a handle on your stress with a stress management daily score showing how your body’s handling it—add Premium for a detailed breakdown of what’s driving your score & various mindfulness options. There are also weekly stress summaries to check-in on your stress-management efforts to help you identify causes of stress, successful management techniques and what to try next.
SLEEP PROFILE PREMIUM & SLEEP SCORE
Learn how to get better rest with Sleep Profile. Get matched with a sleep animal, and see a personalised analysis of your sleep every month.8 Understand your sleep quality with a personalised Sleep Score, and see a breakdown of your time in light, deep & REM sleep.
ACTIVE ZONE MINUTES
Get the results you want from every workout. Active Zone Minutes uses your heart rate to guide you toward your desired intensity level—then helps keep you there.
DAILY READINESS SCORE PREMIUM
Optimise your routine with Daily Readiness, a score using insights from your body so you can see whether you’re ready to work out or should prioritise recovery.4
HEALTH METRICS DASHBOARD
Know your body better by tracking SpO2, skin temperature variation and more. Watch your trends to help discover potential changes in your well-being.5
ON-WRIST BLUETOOTH® CALLS & TEXT NOTIFICATIONS
Answer calls right away on Sense 2 using the built- in mic and speaker, and read texts at a glance on your wrist. Available when phone is nearby.
BATTERY & FAST CHARGING
6+ day battery life keeps you going longer—plus get 24 hours of charge in only 12 minutes.9
VOICE ASSISTANT
Use Amazon Alexa Built-in to get quick news and weather, set bedtime reminders and alarms, control your smart home devices and more—just by speaking to your watch.10
40+ EXERCISE MODES & BUILT-IN GPS
Access multiple exercise modes like skiing and golf while seeing stats in real-time. With built-in GPS, see live updates of your pace & distance during outdoor activities.
GOOGLE WALLET & MAPS
Access Google Wallet to pay on the go and Google Maps for turn-by-turn directions.9
1 Only when your phone is nearby.
2 New Premium users only. Must activate with device. Valid payment method required. Free trial must be activated within 60 days of device activation. Cancel before free trial ends to avoid subscription fees.
3 Google Maps Android Only, iOS launching Q2 2023
4 Daily Readiness, Sleep Profile, Snore & Noise Detect & most mindfulness sessions require a Fitbit Premium membership.
5 The SpO2 feature is not intended to diagnose or treat any medical condition or for any other medical purpose. It is intended to help you manage your well-being and keep track of your information.
6 Data rates may apply. Google apps are not available in all countries or languages.
7 Workouts may be available in English only.
8 Only available in select countries. Not intended for medical purposes or to diagnose or treat any medical condition. This feature is only intended to provide information to assist you with managing your well-being.
9 Varies with use and other factors. Up to 12 hours with continuous GPS.
10 Voice assistant features may vary, see https://www.fitbit.com/global/us/technology/voice.
Specifications
Global
- EAN:
- 0810038858401
- Charger Type:
- Wireless Charger
- Model Number:
- FB521BKGB
General
- Colour:
- Graphite
Features
- Alarm:
- Yes
- Blood Oxigen Sensor:
- Yes
- Call Function:
- Yes
- Compass:
- No
- GPS:
- Yes
- Heart Rate Monitoring:
- Yes
- Step Count:
- Yes
- Water Resistant:
- Yes
Size
- Wrist Size (In):
- 5.5-7.1 small, 7.1-8.7 large
Design
- Strap Color:
- Graphite
Battery
- Battery Type:
- Rechargeable Lithium Ion Battery
- Charge Time (Hrs):
- 12
- Estimated Battery Life (h):
- 144
Display
- Display Type:
- AMOLED
- Touch Screen:
- Yes
Connectivity
- Bluetooth:
- Yes
- NFC:
- Yes
- Wi-Fi:
- Yes
Sensors
- Accelerometer:
- Yes
- Barometer:
- No
- Gyro Sensor:
- Yes
- Heart Rate Sensor:
- Yes
Dimensions
- Depth:
- 40.5mm
- Height:
- 11.2mm
- Width:
- 40.5mm
Weight
- Weight (Kg):
- 0.038
In The Box & Warranty
- Included:
- 2 x Straps Small & Large, Magnetic Charger
- Warranty (Years):
- 1
Why Buy?
Track your wellness without the constant charging hassle
The Fitbit Sense 2 gives you genuine insight into how your body handles daily life — tracking stress, sleep quality, and heart health around the clock so you can make better choices about rest, recovery, and when to push yourself harder.
Instead of guessing why you feel tired or stressed, you get clear data about your sleep stages, stress levels throughout the day, and whether your body is ready for exercise or needs recovery time. The stress management features alert you in real-time when tension is building, giving you the chance to pause and reset before it affects your whole day. With over six days of battery life, you can actually wear it consistently without the daily charging routine that defeats most fitness trackers.
The lightweight design feels comfortable during sleep and workouts, while built-in Alexa lets you set reminders, control smart home devices, or check weather without reaching for your phone. You can take calls directly on your wrist and see text notifications at a glance, keeping you connected without being constantly distracted by your device.
Buy this if…
- You want to understand your sleep patterns and wake up more refreshed
- You need help managing daily stress with real-time alerts and guidance
- You hate charging devices every day and want week-long battery life
- You prefer voice control for quick tasks and smart home management
- You want genuine health insights beyond just counting steps