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Color
Shipping
Specifications
Key Specs
Touch ScreentrueOperating System CompatibilityAndroid, Apple iOSApp CompatibletrueGlobal PositioningGPS, GLONASSMetrics MeasuredActivity vs. inactivity, Altitude changes, Blood oxygen, Respiration rate, Cadence, Calories burned, Distance swam, Distance traveled, Duration of exercise, Electrocardiography (ECG), Hours slept, Laps swam, Pace, Route, Duration of sleep stages, Running/Walking speed, Steps taken, Skin temperature, GlucoseProtective QualitiesWater resistant, Dust resistantMaximum Depth of Water Resistance164 feetBand MaterialSilicone
General
Product NameSense 2 Advanced Health SmartwatchBrandFitbitProduct TypeSmartwatchForm FactorWristwatchModel FamilyFitbit Sense 2Model NumberFB521BKGB-USYear of Release2022ColorGraphite
Design
Case ShapeRounded squareBand TypeInfinityBand ColorShadow GreyClasp TypeOther
Display
Display ScreentrueTouch ScreentrueDisplay TypeAMOLEDColor DisplaytrueClock DisplaytrueBacklit DisplaytrueAdjustable BrightnesstrueCustomizable Watch Facestrue
Compatibility
Operating System CompatibilityAndroid, Apple iOSApp CompatibletrueVoice Assistant Built-inAmazon Alexa
Connectivity
Data Plan RequiredfalseWireless ConnectivityBluetooth
Features
GPS EnabledtrueGlobal PositioningGPS, GLONASSMobile NotificationstrueAlert TypeVibration, VisualSilent AlarmtrueBuilt-In Microphonetrue
Activity
Metrics MeasuredActivity vs. inactivity, Altitude changes, Blood oxygen, Respiration rate, Cadence, Calories burned, Distance swam, Distance traveled, Duration of exercise, Electrocardiography (ECG), Hours slept, Laps swam, Pace, Route, Duration of sleep stages, Running/Walking speed, Steps taken, Skin temperature, GlucoseMulti-Sport TrackingtrueSensorsAccelerometer, Altimeter, Ambient light sensor, Electrical heart rate (ECG) sensor, Optical heart rate (PPG) sensor, Pulse oximeter (Sp02) sensor, Temperature sensor
Performance
Protective QualitiesWater resistant, Dust resistantMaximum Depth of Water Resistance164 feetMinimum Operating Temperature-14 degrees fahrenheitMaximum Operating Temperature113 degrees fahrenheit
Dimensions
Product Width1.59 inchesProduct Length9.79 inchesMinimum Wrist Size139.7 millimetersMaximum Wrist Size220.98 millimetersSizeAdjustableBand SizeAdjustable
Power
RechargeabletrueCharging Interface(s)OtherReplaceable Batteryfalse
Material
Band MaterialSiliconeCase MaterialAluminum
Warranty
Manufacturer's Warranty - Parts1 year limitedManufacturer's Warranty - Labor1 year limited
Other
UPC810073611429
Features
Meet Sense 2—the smartwatch designed to help you stress less, sleep better & live healthier. Get help identifying stress and get the tools to better manage it. Learn more about your sleep and how to improve your rest with detailed nighttime tracking and a unique Sleep Profile. Track key heart-health indicators so you can make more informed wellness decisions. Plus Sense 2 is packed with advanced activity tracking and smartwatch features and includes 6 months of Fitbit Premium Membership1. Fitbit is part of the Google family.
All-day Stress Detection
Recognize stressful events, manage them and move on with our new continuous EDA sensor on Sense 2. It helps detect stress events so you can start to see how and when your stress is triggered. Use of the cEDA sensor may affect battery life.
Stress Management Score
Get a handle on your stress. Higher score? You're showing fewer signs of stress. Lower score? Time to find better balance--try a meditation or go for a walk.
Sleep Profile
It's easier to get better sleep when you know what kind of sleeper you are. Find out whether your sleep mirrors a deep-sleep bear, a slow-to-sleep tortoise or one of our other Sleep Animals., then learn what habits best to support your profile.2
Sleep Stages & Sleep Score
Learn about the quality of your previous night's sleep with a personalized Sleep Score. With Premium, see a breakdown of time in light, deep & REM sleep to see what's impacting your rest.
Fitbit ECG App & Irregular Heart Rhythm Notifications
There are two ways to uncover Afib, right at your fingertips. With the ECG app, you can take an assessment on demand. Plus, use irregular heart rhythm notifications to look for signs of Afib while you're still or sleeping.3
High & Low Heart Rate Notifications
Your heart rate is a key indicator of health, so Sense 2 keeps you informed when it's above or below your set resting threshold.
Daily Readiness Score
Enhance yoru workout routine with a Daily Readiness score that reveals if you're ready to push or should focus on recovery.4
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 you get there.
Built-in GPS
See you real-time pace & distance without your phone using built-in GPS during outdoor activity, then see a map of your workout route in the Fitbit app.
40+ Exercise Modes
Sense 2 tracks more exercises than ever--like skiing, golf, stand-up paddle boarding and more--and see all your stats in real time.
Notifications
Get notifications for calls, texts, calendar events and apps like Gmail and Venmo--plus send quick replies and voice replies right from your wrist. Available when phone is nearby.
Calls From Your Wrist
Use the built-in mic and speaker to take Bluetooth calls hands-free, send callers to voicemail and adjust volume. Available when phone is nearby.
Google Maps
With Google Maps on your Fitbit watch, navigation is easier than ever. Explore a new route confidently with turn-by-turn directions on your wrist. (Phone must be nearby. Available on Android only, Coming Spring 2023 to iOS.)
Google Wallet
Tap your wrist to pay everywhere Google Pay is accepted. The quick, secure and contactless way to check out with your watch.
Built-in 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.5
6-month Fitbit Premium Membership
Get deeper insights and guidance, exclusive workouts, mindfulness sessions and more with the included 6-month Premium membership.1
1 New and returning Premium members only. Must activate membership within 60 days of device activation (requires valid payment). This membership cannot be gifted. Cancel before membership ends to avoid recurring fees. Content and features may change. Terms & conditions apply.
2 Requires a Fitbit Premium membership.
3 The Fitbit ECG app and irregular heart rhythm notifications are only available in select counties and with select Fitbit products; not intended for use by people under 22 years old. The irregular heart rhythm notificiations feature is not intended for use by people with known AFib.
4 Daily Readiness requires a Fitbit Premium membership. Premium content recommendations are not available in all locales and may be in English only.
5 Amazon Alexa and all related marks are trademarks of Amazon.com, Inc. or its affiliates. Alexa is not available in all languages and countries. Alexa features and functionality may vary by location.
Note: Requires use of Fitbit app with compatible iPhone or Android devices. A Google account will be required.
What's Included
Fitbit Sense 2
Infinity Band (Small & Large)
Charging Cable
Questions & Answers (142)
- A: Yes, the same bands seem to fit from my original Sense 1. It's missing many of the features of the Sense 1 though, it's essentially a downgrade from the original
Q: Does this watch detect irregular heart beats or afib? (3 answers)
A: I have Atrial Fibrillation, which is mostly controlled with medicine. This watch will let your phone know when you had it at night. Also, when you are in it, you can detect it with the ECG app.Q: Do this fitbit have a telephone number ? M (3 answers)
A: It will if after you connect it to your mobile phone via bluetooth. I answer/take calls from my fitbit sense 2, able to read text messages from it too! The latest fitbit software updates added the call’s microphone/speaker support which I really appreciate! Now I can talk via my watch conveniently, pretty clear audio! I believe quick text reply’s supported but I prefer doing that on my phone…Q: Does the metal in the watch contain nickel? I have an allergy. (2 answers)
A: It hasn't bothered me and I am sensitive to nickel as well.Q: Can the screen be seen in sunlight? (3 answers)
A: Yes, and it looks very good.Q: Is the charging cable the same or compatible with that of the original Fitbit Sense? (3 answers)
A: Yes it does. I had the first one and now have the second one.Q: i have 2 questions 1 is it waterproof 2 does it count flights of stairs (2 answers)
A: Hi, there. The Fitbit Sense 2 is water-resistant to 50 meters. For more information, please visit this: https://support.google.com/fitbit/answer/14236707 The Fitbit Sense 2 can also track floors. For more information about the Fitbit Sense 2, please visit this: https://support.google.com/fitbit/answer/14237106 For any additional questions and concerns, reach us at: https://goo.gle/contactfitbit
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| Touch Screen | Yes | Yes | Data Not Available-- | Yes |
|---|---|---|---|---|
| Operating System Compatibility | Android, Apple iOS | Android, Apple iOS | Android, Apple iOS | Wear OS |
| App Compatible | Yes | Yes | Yes | Yes |
