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โ Elevate your health game with Sense 2 โ where style meets science!
The Fitbit Sense 2 is a premium health and fitness smartwatch featuring continuous heart rate monitoring, ECG app for atrial fibrillation detection, SpO2 sensor, advanced sleep tracking, and built-in GPS. Designed for all-day wear with water resistance up to 50 meters, it offers Bluetooth calls, notifications, Alexa integration, and a 6+ day battery life. Includes a 3-month Google Health Premium membership for personalized coaching and advanced analytics, making it a comprehensive wellness companion for the modern professional.






















| ASIN | B0B4MV1TGL |
| Additional Features | Sleep Monitor, Stress Monitor, Sleep Monitor, ECG, Oxymeter (SpO2), Heart Rate Monitor, GPS, Time Display, Notifications, Water Resistant |
| Age Range Description | Adult |
| Band Color | Blue |
| Band Length | 40.5 Millimeters |
| Band Material Type | Silicone |
| Battery Average Life | 6 days |
| Battery Capacity | 162 |
| Battery Cell Type | Lithium Ion |
| Battery Charge Time | 12 minutes |
| Best Sellers Rank | #742 in Electronics ( See Top 100 in Electronics ) #18 in Smartwatches |
| Brand | Fitbit |
| Built-In Media | Watch Band |
| Case Material Type | Aluminum |
| Color | Blue Mist/Pale Gold |
| Communication Feature | Bluetooth Call,Message, Notifications |
| Compatible Devices | Smartphone |
| Compatible Phone Models | Apple iOS 16.4 or higher & Android OS 11.0 or higher |
| Connectivity Technology | Bluetooth |
| Controller Type | Android |
| Customer Reviews | 4.1 out of 5 stars 9,974 Reviews |
| Display Type | AMOLED or OLED |
| GPS Geotagging Functionality | Built-in GPS |
| Human Interface Input | Touchscreen |
| Item Dimensions | 1.57 x 0.47 x 1.57 inches |
| Item Dimensions D x W x H | 0.47"D x 0.47"W x 1.57"H |
| Item Weight | 1.3 Ounces |
| Manufacturer | Fitbit Inc |
| Memory Storage Capacity | 4 GB |
| Metrics Measured | Stress,Heart Rate,Body Temperature,Sleep,SPo2 |
| Model Name | Fitbit Sense 2 |
| Model Number | FB521GLBM-US |
| Operating System | Android |
| Resolution | 348 x 348 |
| Screen Size | 1.58 Inches |
| Shape | Square |
| Sim Card Size | eSIM |
| Special Feature | Sleep Monitor, Stress Monitor, Sleep Monitor, ECG, Oxymeter (SpO2), Heart Rate Monitor, GPS, Time Display, Notifications, Water Resistant Special Feature Sleep Monitor, Stress Monitor, Sleep Monitor, ECG, Oxymeter (SpO2), Heart Rate Monitor, GPS, Time Display, Notifications, Water Resistant See more |
| Sport Type | Fitness |
| Style Name | Modern |
| Supported Application | GPS, Phone |
| Supported Satellite Navigation System | GPS |
| Target Audience | Unisex Adult |
| UPC | 810073611436 |
| Unit Count | 1.0 Count |
| Warranty Description | 1 year manufacturer |
| Warranty Type | Limited |
| Water Resistance Depth | 50 Meters |
| Water Resistance Level | Water Resistant |
| Waterproof Rating | [IPX4 or better] |
| Wearable Computer Type | Smart Watch |
| Wireless Communication Standard | Bluetooth |
| Wireless Compability | Bluetooth |
| Wireless Provider | Unlocked |
A**E
Beautiful Tracker, Great Features, No Problems Using in the Pool
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.
F**S
Has actually changed my life
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
G**P
Quality Unit Well Worth the Price.
A family member got ill and the doctor recommended that she get a Fit Bit to monitor her activities. This unit was simple to set up and use and she likes it alot. Yes, it's a big help on keeping track of her health issues. These watches will monitor just about everything nowadays. Very much worth the price for peace of mind.
B**N
a tool that just made me angrier everyday - not worth your money
i was a diehard fitbit customer since 2016. over the past several years the quality has steadily degraded since google purchased fitbit and overhauled all the software that actually worked with the product. i would have recommended fitbit for years but now i would warn people against it. Major cons: life/durability, connectivity and functionality Durability: i bought my first fitbit sense in December 22 and it died by December 23. I bought this fitbit sense 2 in January 2024 and now it is experiencing the same charging issue. the charging prong connections get clogged over time due to sweat or dirt, but i cleaned this one more regularly than the previous one and it stopped charging much earlier. I can still kind of get the new one to work if I stand and hold the charger there and wiggle it around till it connects, then gently place it and make sure it doesnโt disconnect, but it is definitely on itโs way out. It used to stay charged for 5 days on one charge if I didnโt use GPS, now it is 2-3 days and I have to be super careful about not letting it get to zero because it is impossible to tell if it is connected once it dies fully. EDIT: I wrote this review July 20, 2024; as of August 20, 2024 the Fitbit sense 2 will not charge no matter what I do so I cannot even reset it or update it because it wonโt turn on. Donโt waste your money (I also have 4 sense chargers & none work - it is definitely the watch) Connectivity: every single time I open the fitbit app it is a fight to sync the device and takes probably about 15-30 mins on average to get to work. it is infuriating, and when it does finally sync, half the information doesnโt show up correctly so you have to try to run it again or wait another 15-30 minutes for that to show up. Two nights ago I was trying to sync for over 2 hours. This is really frustrating while Iโm in the middle of a workout, especially a run where I donโt want to stop and fiddle with my watch/phone, or when Iโm trying to quickly check my stats on the go Functionality: This isnโt the WORST thing about it - it does its job for tracking for the most part. I have lost a lot of sleep data due to the connectivity and app issues though which was a big factor I purchased the sense rather than the apple watch initially so Iโm annoyed about that. They also got rid of all the social features in the app in January. I also learned recently you donโt have to pay a premium subscription for a lot of the analytics (sleep, cardio health, etc) you do on Fitbit if you get a garmin or apple watch. Sometimes I feel like the tracking is lagging compared to its competitors, it feels like google is just stagnating Fitbit using its established consumer base until they can get more marketshare with the pixel watch. Pros: appearance, comfort, technically does what it says, just not very well All that being said, if it wouldnโt keep dying within a year of purchase and it would actually connect to my phone/the app actually worked I would probably buy another sense next just because I am familiar with it, it does the trick, and it has all my past data. However it doesnโt seem like that will be improving so I will have to switch on my next fitness tracker I have to buy, which will probably be quite soon unfortunately. EDIT: i will not ever buy a sense again actually, see previous edit
R**S
Great option - but not forever
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.
A**R
Insightful, easy to use, looks great!
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!
D**T
Seems to work well and does the things I wanted.
Tracks stairs, steps, and sleep, among other things. The Charge 6 does not do stairs anymore.
M**Y
Eh itโs alright
While this watch has some strong points, it does have its drawbacks. After nearly six months of use, youโre either a fan or youโre not. In my view, the Fitbit Sense 2 doesnโt match the responsiveness or intuitiveness of the Apple Watch. For instance, even though wrist flipping to wake the screen is enabled, it often fails to respond as expected. Iโve also experienced several heart arrhythmias and pauses while wearing the Fitbit (confirmed by a Cardiology halter monitor), but the Fitbit didnโt pick up on any of them, making the feature useless to me. Another issue is the workout tracking. If I forget to manually end a session, the watch at times wonโt recognize the inactivity, continuing for hours after the workout is finished, which negatively affects the accuracy of data for that day. I have to manually make the corrections at times. Sleep tracking also falls short. It often misinterprets how long Iโve been awake, logging a 6.5-hour sleep as 8 hours if I remain in bed (e.g., logging times when Iโm awake as โlight sleepโ), which skews the wellness and readiness metrics. I didnโt have these issues with my Apple Watch. Additionally, dealing with third-party vendors for custom watch faces, through the app, isnโt as seamless as contacting Apple customer service for support with an Apple Watch. While wearing the watch continuously to track sleep and daily activities seems ideal, Iโve had concerns about skin irritation, peeling, and even an odd odor developing after extended wear. Iโve since switched the wristband to something more skin-friendly. However, given that itโs a Bluetooth device, I do wonder about the safety of wearing it 24/7. Another disappointment is the wellness feature and notifications, which feel frequent and unnecessary, despite being a primary reason for my purchase. Itโs as if the watch is constantly asking trivial questions like whether the sky is blue & isnโt very helpful. Iโve since switched it off. On the positive side: โข The battery life is quite impressive, lasting days, and charging quickly. โข I appreciate the step counting, goal setting, and the subtle vibration for alarms. The way the data is laid out is user-friendly, very detailed and great for tracking trends. โข Customizing the watch face, including colors, and the features you wish to see are great. โข The sleek design is also light weight and appealing. All in all, it has positives but lacks in some of the more important areas. If returning it was still an option, Iโd likely consider exploring other options, possibly even return to an Apple Watch.
J**N
Great comunication device
This is a great product. We are very familiar with it, and it works smoothly with the existing Fitbit app on our phones.
T**N
Just great
Just great
Z**A
Good choice compared to Apple Watch 8
Good product . Switched from Apple Watch 8 ( which crashed after 2 yrs of use) and find this so superior in terms of battery life. Features are almost same but this is a improved version for a better price
E**E
Buen reloj!
Me ha funcionado bastante bien, habrรก que esperar que sirva mucho tiempo. Pero las funciones son buenas, la app es buena y cumple con lo que dice que hace. En verdad me gusta bastante.
G**H
Excellent
Fitbit Sense 2 is an excellent product, will sure recommend, i am using this for almost an year and really happy with the purchase.
Trustpilot
1 month ago
1 month ago