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Fitbit

Fitbit Sense 2 Health and Fitness Smartwatch - Shadow Grey/Graphite | with Stress and Sleep Tools - 3-Month Google Health Premium Membership Included - ECG App, SpO2, 24/7 Heart Rate, and GPS

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Arrives Tuesday, Aug 11
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Color: Shadow Grey/Graphite


Features

  • Learn to manage stress, sleep better and live healthier with Sense 2 an advanced health and fitness smartwatch
  • Manage stress and live healthier: All-day stress detection with cEDA and daily Stress Management Score, ECG app for atrial fibrillation assessment[1], irregular heart rhythm notifications[2], SpO2[3], health metrics dashboard[4], mindfulness content
  • Measure and improve sleep quality: Daily sleep stages and Sleep Score, smart wake alarm and do not disturb mode
  • Enhance activity: Built-in GPS and workout intensity map, Daily Readiness Score, Active Zone Minutes, all-day activity tracking and 24/7 heart rate, 40+ exercise modes and automatic exercise tracking, water resistant to 50 meters

Description

Meet Sense 2—the smartwatch designed to help you stress less, sleep better & live healthier. Fitbit is part of the Google family. 1) The Fitbit ECG app is only available in select countries and with select devices. Not intended for use by people under 22 years old. See fitbit.com/ecg for additional details. 2) Irregular rhythm notifications are only available in select countries and with select Fitbit products; not intended for use by people under 22 years old or with other known arrhythmias. See fitbit.com/irregularrhythm for additional details. 3) Not available in all markets. 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. 4) The Health Metrics dashboard and the metrics displayed in the dashboard are not available in all countries. This feature should not be relied on for any medical purposes. It is intended to provide information that can help you manage your well-being. The SpO2 feature requires more frequent charging. 5) Requires a Fitbit Premium membership. Premium content recommendations are not available in all locales and may be in English only. 6) When phone is nearby. 7) See bank and transit availability at fitbit.com/fitbit-pay/banks 8) Amazon, Alexa and all related marks are trademarks of , Inc. or its affiliates. Alexa is not available in all languages and countries. Alexa features and functionality may vary by location. 9) Varies with use and other factors. Up to 12 hours with continuous GPS. Get 24 hours of charge with 12 minutes of charging. 10) 6 months of Premium for 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. Requires use of Fitbit app with compatible iPhone or Android devices. A Google account will be required.

Product Dimensions ‏ : ‎ 1.57 x 0.47 x 1.57 inches; 6.72 ounces


Item model number ‏ : ‎ FB521


Department ‏ : ‎ mens


Batteries ‏ : ‎ 1 LR44 batteries required. (included)


Date First Available ‏ : ‎ September 23, 2022


Manufacturer ‏ : ‎ Fitbit Inc


Best Sellers Rank: #1,098 in Electronics (See Top 100 in Electronics) #22 in Smartwatches


#22 in Smartwatches:


Customer Reviews: 4.1 4.1 out of 5 stars (10,100)


Operating System: Android


Additional Features: Activity Tracker, Stress Tracking, Sleep Monitor, ECG, Heart Rate Monitor, GPS, Notifications, Phone Call, Text Messaging, Bluetooth


GPS Geotagging Functionality: Built-in GPS


Band Material Type: Silicone


Case Material Type: Aluminum


Water Resistance Level: Water Resistant


Sport Type: Fitness


Human Interface Input: Touchscreen


Supported Application: GPS, Sleep Monitor


Water Resistance Depth: 50 meters


Supported Satellite Navigation System: GPS


Controller Type: Android


Metrics Measured: Stress,Heart Rate,Body Temperature,Sleep,SPo2


Closure Type: Buckle


Brand: Fitbit


Model Name: Fitbit Sense 2


Target Audience: Unisex Adults


Age Range Description: Adult


Model Number: FB521


Built-In Media: Watch Band


Warranty Description: 1 year manufacturer


Wearable Computer Type: Smart Watch


Unit Count: 1 Count


UPC: 810073611429


Manufacturer: Fitbit Inc


Shape: Square


Style Name: Modern


Color: Shadow Grey/Graphite


Band Color: Grey


Battery Capacity: 162


Battery Cell Type: Lithium Ion


Battery Average Life: 6 days


Battery Charge Time: 2 hours


Connectivity Technology: Bluetooth


Wireless Compability: Bluetooth


Wireless Provider: Unlocked


Communication Feature: True


Screen Size: 1.58 inches


Display Type: LCD


Resolution: 348 x 348


Compatible Devices: Smartphone


Compatible Phone Models: Apple iOS 16.4 or higher & Android OS 11.0 or higher


Item Weight: 6.72 ounces


Item Dimensions: 1.57 x 0.47 x 1.57 inches


Band Length: 40.5 millimeters


Memory Storage Capacity: 4 GB


Warranty Type: Standard


Waterproof Rating: IP67


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Tuesday, Aug 11

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Top Amazon Reviews

    • Best price/performer on the market
Color: Shadow Grey/Graphite
This watch is fantastically functional: it does everything a watch should do and costs far less than the Apple watches. The best part is that it goes days without needing to be charged, and charges completely in about 30 minutes. I keep a charging cable in my car and just pop it on while I’m driving. The charging cables are a little funky, but replacements online are inexpensive so when the pins on one die, I just replace it. The only thing I don’t like is the wrist band that comes with it. Fortunately there are many third party options available so you can choose what you like. I have mine paired with my iPhone and it does a good job of tracking everything. It even starts tracking for walking and biking automatically when I forget to tell it and recognizes when I’ve stopped. Sleep tracking is also useful - just don’t get the idea that it’s perfect and you should do everything it tells you. Sometimes the “readiness” rating seems suspect. Still trying to decide whether I like the new AI “Coach”. It gives useful device that matches advice from my trainer, but it’s a little too chatty for my taste and sometimes goes off trying to solve a problem that doesn’t really exist. ... show more
Reviewed in the United States on July 3, 2026 by Cindy H.
    • Beautiful Tracker, Great Features, No Problems Using in the Pool
Color: Blue Mist/Pale Gold
Update to my previous review: Leaving at 5 stars for quality, durability, and features. Battery life seems to be about the same as my old Fitbit HR. Initially, I got about 5 days out of the first couple of charges. Now I'm getting about 3-4. I have no problem with that. I charge my phone more often so I don't know why I would expect more from my fitness device. How quickly the battery drains seems to be dependent on my level of activity. I just check every day to see how much it's drained so I don't get caught out with a dead battery. Haven't allowed it to go less than 20%. It does not track steps accurately when I do pool exercises. I manually calculated about 2400 steps during my pool therapy and the tracker only counted a bit over 1900, including steps walking to and from the pool and so forth. All total, there should have been closer to 3000 steps so that's a pretty big disparity. Frankly, I have not found any fitness tracker to be very accurate with step count during exercise as it depends on how much arm swing is involved. Previous Review: Received my Fitbit Sense 2 (Mist blue and light gold) a few days ago and I love almost everything about this fitness tracker. The mist blue color is a pale blue-grey. The watch casing is a soft gold color like you might see on a car. It matches the seller's photo perfectly (on my PC monitor anyway.) I think it's very pretty, albeit larger than I like in a watch. I have tiny wrists and large watch bands/faces are awkward on me. But, to get the features I wanted, it's worth getting used to. I don't care for silicone bands as they don't breathe but I suppose for a sport watch, it might be the best option. The buckling system was concerning for me because you have to pop the band hole over a pin, then tuck it under on the other side against your wrist. It looked like it would be uncomfortable to clasp it and wear, but I'm happy to say it's not. Just feels a bit weird to me because it's bulky for my wrist size. It was relatively easy to set up. The only difficulty I had was when I logged into my Fitbit app previously associated with my Fitbit Charge HR, it kept asking me to log into my account, but I was already logged in. When I entered my password, it said it was incorrect but it wasn't. I finally tried using my email PW and got into my account. What was confusing was, the Fitbit logo was at the top next to, "log into your account." So, buyer be aware, if you have to log into an existing Fitbit account, they want your email address/PW, not Fitbit PW. The biggest reason I chose this model was for water use. I have to do pool therapy and wanted all my steps and activities to be logged in real-time. I wore it in the pool, hot tub, and shower today and there were no problems with it at all. Just be sure to read all the instructions carefully. You can get more info on the Fitbit website for details on setup, use, and care. The device only came with quick setup instructions in the box. I haven't really paid much attention to the sleep tracking as I have a sleep number bed that tracks that. And I haven't compared it against another heart rate monitor. However, based on the level of activity and how I felt during pool walking and exercises, it seemed like the numbers were relatively accurate. My favorite feature is the hourly buzz to get moving. It not only buzzes on my wrist to alert me it's time to move, but after I get up and walk around, it buzzes again to let me know I've completed 250 steps (based on my current setup.) This feature is priceless as I sit at a PC all day and forget to move. Overall, 3 days in, I'm very happy with this purchase and feel that the price was fair compared to similar devices with the same features. It also came with 6 months of free premium app services which I appreciate because it gives me a good amount of time to decide if I want to continue with the premium for a monthly fee. I do not find that app either intuitive or user-friendly and it will take some time for me to get the hang of using it. Should I run into any problems with my Sense 2 in the future I'll update this review. ... show more
Reviewed in the United States on November 29, 2023 by ANNEE
    • Has actually changed my life
Color: Shadow Grey/Graphite
I've always been into fitness and health. I've always wanted to track my steps but didn't want some dumb looking smart watch on me all the time. BUT. This watch looks expensive and nice like an apple watch. Not to say thats what you're buying it for but it absolutely doesn't look stupid. It's almost like a game every day to see how many steps you can get. I am 6'1 and went from 243 pounds to about 223 pounds in just 3 months. It's insane. I already had the ability to be in okayish shape but this has changed my life for the better. For 220 dollars this might be the best investment anyone can ever make. Also tracks sleep so you dont have to pay a small fortune for a whoop ring ... show more
Reviewed in the United States on June 4, 2026 by Fantastic amp. Bumped my subs super hard. Used it on 20% power and that was enough for me. Amp lasted around 3 weeks
    • Utterly worthless!
Color: Shadow Grey/Graphite
After 5 years of good service my old Versa was struggling to keep a charge for 24 hours so I decided to replace it with a Sense 2. Huge mistake! This device drops to 20% charge in about 12 hours and then requires charging for about 2 hours. You can wear it during the day or at night, but you really can’t do both unless you set aside a couple of hours for charging. The watch has all sorts of sensors, but they all need to be turned off if you want 12 hours of life. Searching the message boards this seems common. I will play with the recommendations Insee there for a couple more days before returning it, but I’m not hopefull. It is inexcusible for a company to try to market a product that falls so short of their written claims! Avoid Fitbit if you are looking for a smart watch! Update: Turning off things like stress management and a restart apear to have imroved the battery life. Yesterday it dropped to about 60% including a 40minute walk with the GPS on. Unfortunately, it won’t charge back to 100% in the time it takes me to shower and dress like my old Versa. So it is probably a charge twise a day affair rather than the advertized once every 6 days. As others have remarked, the HR monitor seems to be incredibly inaccurate. It takes quite a while to react when starting a vigourous exercise and the HR laghs the obvioud signs like heavy breathing by several minutes. It barely registers exercises like the rowing machine in spite of the evident level of exertion. On a very steep hill that left me huffing and puffing it barely cracked into the fat burn zone. For some reason, the weather app has decided to stop working, too. The Google Maps shows turns that have nothing to do with the route being shown on the phone. This came and went, but I certainly wouldn’t trust it if I needed to get somewhere. I’m still quite dissatisfied. More later… Well, I did get the weather app to work by turning location services to “always”. On days I don’t use GPS I can actually charge it during my morning shower and get close to 100%. The heart beat monitor continues to be awful. My old Versa was often slow to recognize exercise, but the Sense 2 can take 10 minutes to even notice increased heart rate. I started the trial offer on Premium but don’t see anything there that would persuade me to pay for it once the trial period ends. Further update - for some reason, the Sense 2 has begun to mistake driving for bicycling. Based on it’s claims, I should easily win the tour de france. Pretty good for an old fat guy😃 Update after another month. The charging seems to have sorted itself out enough that I only need to charge once per day. The GPS IS some sort of random number generator, with the distance for the same exact walk varying by around 30% from day to day. Very brisk walks often show a slower pace than casual strolls. The Sense has begun to begrudgingly acknowledge my heart is beating during rowing sessions, but is wildly inaccurate. For the stationary bike it tends to not register anything, then overshoot to ridiculous levels before settling in to reasonable agreement with the HR monitor on the bike. The sleep logging seemed to stop at 14 days even though I have worn the Sense every night for at least 40 days. I’m not sure I care what my “sleep animal” is anyway - is this intended for children, or what??? My next fitness tracker/smart watch will definitely not be Fitbit. I will miss having 7 or so years of history, but if most of it is bogus, who cares? ... show more
Reviewed in the United States on June 23, 2023 by C. Guernsey
    • Great option - but not forever
Color: Blue Mist/Pale Gold
This has worked really well for about 1.5 years. One big issue with Fitbit is the sleep measuring, you have to remain motionless for an hour before it starts counting sleep. And I sleep way too badly for it to measure well. Battery life was REALLY good until a few weeks ago, almost exactly 2 years after getting it. Battery was lasting about a week. Now I have to charge it so often, it lasts about a day and a half. That's fine for some people but a way downgrade from what it was. 2 years, must be time for a new one. ... show more
Reviewed in the United States on March 31, 2026 by Rebecca Adams
    • Awesome watch!!!
Color: Shadow Grey/Graphite
Perfect for me!!!
Reviewed in the United States on July 29, 2026 by Melissa
    • Insightful, easy to use, looks great!
Color: Blue Mist/Pale Gold
Review Image by Amazon Customer
I got this as a gift for my wife. As an Apple Watch owner, I am impressed with its health tracking capabilities. It holds a charge much longer than my Apple Watch, it is way easier to navigate, looks great, and costs much less! She gets all of the insights I do, in an easier to navigate app that the ihealth. My favorite parts are the exercise recognition and the sleep information. The only advantage of the apple watch is the phone control capabilities, which I never use due to being a pain because of how small it is to type on. Once my Apple Watch gets to the point of replacement, I will definitely be getting a Fitbit instead! ... show more
Reviewed in the United States on March 25, 2026 by Amazon Customer
    • Not as Bad as I First Thought, But...
Color: Shadow Grey/Graphite
When my original Sense died prematurely, I researched whether to just get another one, or spend an additional $80 to upgrade to Sense 2. I decided not to risk another premature death of a Sense, and went for the new model, expecting everything the Sense did plus new functions. I was unpleasantly surprised that the "look and feel" were so different, for no apparent reason. Specifically, what you see when you swipe in a direction has changed. What was a left swipe is now a down swipe. What was a down swipe is now an up swipe. From a left or right swipe, there are some new tiles with corresponding new functions, which are upgrades, but some (hourly activity this hour, and hours today with at least 250 steps) are gone and not available on the watch, only on the app, a downgrade. After 24 hours with the Sense 2 I am faced with a decision whether to return it and buy a Sense, or keep it. My two star rating reflects my feeling that this product deserves a grade of D. Updated to add two more negatives: The heart rate is often missing from the clock face. This may be the fault of the face or the device itself, but it’s a fault. I like a statistics heavy face. Two minute quick scan mindfulness sessions are seldom logged, despite repeated refreshes (synchronizations) or quick scans. Only the longer guided sessions are reliably scanned. My decision whether to keep or return the Sense 2 is still pending, awaiting results of functions that require more time. Five month update: This was prompted by the email reminder that the free introductory six months of Fitbit Premium would auto-renew at the end of the month, for $90 a year, unless I opt out at least a day before expiration. The problems noted above most annoyingly persist. On the other hand, I have come to rely on some of the additional capabilities and health information available only with Premium; and tempted by those I have yet to explore, I have reluctantly and somewhat unhappily decided to continue. Update, September 1, 2025, after just over 27 months: The battery now lasts less than 48 hours. I wear the watch continuously, including yard work with a gasoline powered trimmer, blower, and mower, and remove it only for charging. Another negative that I forgot mention earlier is the charger that came with it failed long ago, apparently because one of the protruding electrodes no longer protrudes enough to make contact with the watch's recessed electrode. The aftermarket charger works fine, but I shouldn't have had to buy it. Otherwise I have come to rely on the watch and the health information it provides. If the battery situation continues to deteriorate, I look into the service contract. If it isn't covered I will probably, and again somewhat reluctantly, buy another Sense 2, unless there's a newer better model by then. Another update, 5/27/2026: This evening Google pushed the new Fitbit app to my iPhone. It doesn't display most of the data, gray blocks instead. So far, the watch is fine but the app is useless. Update 7/1/2026: I changed my previous one star to three, equivalent to a grade of C-, after Google finally pushed out the full app and i worked with it a while. The app is heavy with AI coaching that is not always accurate: when I edit a statistic to correct it, the correction doesn't ripple through all tabs or AI sermons. And the AI often sends premature notifications. One example was when I woke up in the middle of the night, took a sip of water, noticed that my phone just lit up, and opened it to see that I've had only 3 hours and 28 minutes of sleep overnight, and the AI has given me all sorts of advice based on the assumption that I was awake and up for the day. The blurb from the AI disappeared when I actually got up several hours later, but only after I forced a refresh several times. There have been a few features that I couldn't access. One of them, hourly step activity, was eventually made partially available in the app, but actual progress each hour is available only during the final ten minutes of each hour. Another feature that I couldn't get to was the ECG: the AI's instructions didn't work, its Plan B workaround also failed, and when I looked for Plan C the AI gave up and referred me to the website that needed a user ID and password that I've forgotten because they haven't been needed in years. My previous Fitbit Sense and app used to show a little map of the paths I took when logging a walk, but sadly that feature is no longer available. I expect Google to work out the bugs and correct the omission(s?), but it's hugely disappointing that there are any bugs or omissions at all. ... show more
Reviewed in the United States on May 31, 2023 by Tried It

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