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⌚ Elevate your health game with Fitbit Sense 2 — where wellness meets smart style!
The Fitbit Sense 2 is a cutting-edge health and fitness smartwatch featuring all-day stress monitoring with cEDA, ECG app for heart rhythm assessment, SpO2 tracking, and a comprehensive health metrics dashboard. It offers personalized sleep insights, built-in GPS with workout intensity mapping, 40+ exercise modes, and 24/7 heart rate monitoring. Designed for seamless all-day wear, it includes Bluetooth calls, texts, Alexa voice assistant, Fitbit Pay, and a long-lasting 6+ day battery. The package comes with both small and large bands and a 6-month Fitbit Premium trial for advanced analytics and personalized guidance.

















| ASIN | B0B4MV1TGL |
| 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 Material Type | Silicone |
| Batteries | 1 Lithium Ion batteries required. (included) |
| Battery Average Life | 6 days |
| Battery Capacity | 162 Milliamp Hours |
| Battery Cell Type | Lithium Ion |
| Battery Charge Time | 12 minutes |
| Best Sellers Rank | #897 in Electronics ( See Top 100 in Electronics ) #22 in Smartwatches |
| Brand | Fitbit |
| Built-In Media | Watch Band |
| Case Material Type | Aluminum |
| Color | Blue Mist/Pale Gold |
| Communication Feature | [PARTIAL] Bluetooth for call and message alerts |
| Compatible Devices | Smartphone |
| Compatible Phone Models | Wide range of smartphones |
| Connectivity Technology | Bluetooth |
| Controller Type | Android |
| Customer Reviews | 4.1 4.1 out of 5 stars (9,780) |
| Date First Available | September 23, 2022 |
| Department | mens |
| 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 Weight | 1.3 Ounces |
| Item model number | FB521GLBM-US |
| Manufacturer | Fitbit Inc |
| Manufacturer | Fitbit Inc |
| Memory Storage Capacity | 4 GB |
| Metrics Measured | [Multiple] |
| Model Name | Fitbit Sense 2 |
| Model Number | FB521GLBM-US |
| Operating System | Android |
| Product Dimensions | 1.57 x 0.47 x 1.57 inches; 1.3 ounces |
| Resolution | 348 x 348 |
| Screen Size | 1.58 Inches |
| Shape | Square |
| Sim Card Size | eSIM |
| Sport Type | Fitness |
| Style Name | Modern |
| Supported Application | GPS, Phone, Voice Assistant |
| 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 | 164 Feet |
| Water Resistance Level | Water Resistant |
| Waterproof Rating | [IPX4 or better] |
| Wearable Computer Type | Smart Watch |
| Wireless Compability | Bluetooth |
| Wireless Provider | Unlocked |
K**A
Works for me
Good smart watch, still trying to understand why it does some strange things, like counts steps while I’m sleeping. But all in all it’s fills my needs.
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!
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**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.
C**Y
Utterly worthless!
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?
S**D
Would definitely order again
I ordered this for my husband as he had an issue with AFIB the week before. This is perfect. It monitors everything we need to keep an eye on. He's not tech savvy at all but he can work with this. It's easy to program and easy to read. We like it so much I'm buying one for myself.
J**N
This is a great product. We are very familiar with it, and it works smoothly with the existing Fitbit app on our phones.
M**N
Lo busqué en varias tiendas y aquí fue la mejor opción de compra además segura.
T**N
Just great
Z**A
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
G**H
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
2 months ago
1 month ago