Fitbit Sense Advanced Smartwatch with Tools for Heart Health, Stress Management & Skin Temperature Trends, White/Gold, One Size (S & L Bands Included)
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Returnable until Jan 31, 2026 Learn more
Returnable until Jan 31, 2026 Learn more
This item's return window has been extended for the holiday season: Returnable until Jan 31, 2026
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Availability:
In Stock.
Arrives
Sunday, Dec 21
Color: White/Gold
Features
- EDA Scan app detects electrodermal activity which may indicate your body's response to stress and a built-in skin temperature sensor logs yours each night so you can see when it varies.Band Size : Small : Fits wrist 140mm - 180mm in circumference. Large : Fits wrist 180mm - 220mm in circumference
- Assess your heart for atrial fibrillation a heart rhythm irregularity- and easily share results with your doctor (The Fitbit ECG app is only available in select countries. Not intended for use by people under 22 years old.Operating temperature: 14 to 113F
- An on-wrist skin temperature sensor tracks yours each night so you can see how it varies. You can also see your nightly blood oxygen levels at a glance with our collection of clock faces.Radio transceiver: Bluetooth 5.0.Operating temperature: -10 to 45 C
- High & low heart rate notifications alert you if yours seems above or below your average.Battery lasts 6 plus days plus, fast charging gives you a full day's charge in just 12 minutes (Varies with use and other factors; up to 12 hours with continuous GPS).Use built-in GPS during runs, hikes, rides and more to see pace & distance without your phone and use the built-in mic and speaker to take Bluetooth calls hands-free when your phone is nearby (Requires more frequent charging).
Description
Meet Fitbit Sense—the advanced smartwatch that helps you tune in to your body and guides you toward better health. Assess your heart for atrial fibrillation (Afib) with a compatible ECG app right on your wrist, track & manage stress, better understand your sleep quality and even keep an eye on patterns in your skin temperature. Plus, Sense unlocks a 6-month free trial of personalized guidance and advanced insights from Fitbit Premium for new users. Fitbit is part of the Google family. Requires use of Fitbit app with compatible iPhone or Android devices. A Google account will be required.
Operating System: android
Memory Storage Capacity: 6400 MB
Special Feature: GPS, Heart Rate Monitor, Notifications, Sleep Monitor, ECG, Stress Tracking, Time Display
Battery Capacity: 266 Milliamp Hours
Connectivity Technology: Bluetooth
Wireless Communication Standard: Bluetooth
Battery Cell Composition: Lithium Ion
GPS: True
Shape: Heart
Screen Size: 1.58 Inches
Is Discontinued By Manufacturer : No
Product Dimensions : 1.59 x 1.59 x 0.49 inches; 1.1 ounces
Item model number : FB512GLWT
Department : Unisex-Adult
Batteries : 1 Lithium Polymer batteries required. (included)
Date First Available : August 25, 2020
Manufacturer : Fitbit Inc
Best Sellers Rank: #10,125 in Electronics (See Top 100 in Electronics) #402 in Smartwatches
#402 in Smartwatches:
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Sunday, Dec 21
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.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
Color: White/Gold
Let me first say that I am not a smart watch person. I had the Samsung Watch before and absolutely hated it. I was very resistant to switch from my faithful Charge 3 to a new device that seemed similar to a smart watch, especially one that clearly had features that hadn't been fully sorted out yet. At the same time, some of these features, like the 24/7 heartrate monitoring and improved data for sleep monitoring were definitely a draw. I haven't had this device for months yet, and may update this in the future if I notice different things, but I will say if you go into this with the idea that you're buying a health tracker, you'll get about what you expect. This is not a fancy smart watch and if you want all the music features, additional apps, and things of that nature, this device is not for you. It doesn't function like a smart watch near at all. The music player is limited to Deezer, which I haven't tried. It allows you to navigate Pandora and Spotify on your phone through the device, which is literally the only feature I wanted a smart watch for when I was teaching dance, so for me it's perfect. Almost everything else focuses on your health. Other reviews have commented on the press point to activate the watch being problematic, but I have had no issues. It doesn't always come on when I turn my wrist to face, which was the same issue with all my previous Fitbit devices. However, the press point to turn it on is basically the same idea as my Charge 3, so maybe that's why I have no issues there. Not all the newly available metrics have obvious uses. The additional sleep data is very much up for interpretation, but if you keep a log with how you feel when you wake in the morning, any correlation becomes obvious. While I don't know how to interpret this data myself, it is something I've mentioned to my doctor and we will be reviewing on my next visit to help give us a bigger picture of what contributes to my poor quality sleep and other sleep challenges. This is one of the reasons I opted to upgrade when my Charge 3 was still working great and perfectly serviceable. In additional metrics, we should talk about that EDA scan that's mentioned in all the reviews, but no one seems to understand. I'm actively trying to train myself to make use of that feature. A nifty little thing I've noticed, EDA responses don't appear when I'm under high stress, but they do appear when I've experimented with using the quick scan feature as a non-visual timer for deep breathing in the middle of a anxiety attack. While I don't know if this is reliable, it is giving my medical team more information to try and figure out what's going on, so this may have useful implication in the future. Another note on the EDA quick scan, as I haven't done any of the guided sessions, it gives you information on your heartrate variability in comparison to your baseline, which I assume is taken from your sleep baseline. Below baseline indicates high stress where above indicates a relaxed state. For me, this has become a useful tool to make sure I'm getting enough exercise, which directly impacts my depression. I know some people out there say "just make sure you get XYZ amount of exercise every day." For me this is giving me useful data on how much and how often is enough to get that number up. Will a run or yoga in the morning be effective for the day? Does an evening routine impact the next morning? It's quantifiable data that I can use as a cue in building my own routine. I also want to mention the other feature that sold me on this device, the 24/7 heartrate monitoring. Before the pandemic (and became increasingly difficult throughout the pandemic) I had taken up running. One of the things my training app asked was my heartrate during my run. Only problem was I could not accurately get that data as my Charge 3 needed me to remain stationary for an accurate heartrate read. While my heartrate on a run may not have been a necessary detail to include, not having that heartrate often meant exercises were missed and other activities that possibly should have flagged a response didn't. My active minutes have dramatically increased as a result of having more accurate heartrate monitoring. I am also getting a much more accurate look at my activity levels and my calorie intake versus calories burned. This constant data is a lot more useful for anyone who is monitoring their health during exercise, trying to get an accurate calories in/calories out record, and anyone trying to get an accurate picture of what their activity level is throughout the day beyond simply steps to include things previous trackers may have missed. It even picked up on 4 minutes of cardio levels while I was doing an excited sword demonstration for my kids while homeschooling. Is that 4 minutes useful time? Probably not, but it's good to put in my list of activities Fitbit wouldn't have noticed before, but logs now, which also includes dance and other movement exercises that weren't enough to trigger my Charge 3 to identify them as exercise. It was disappointing that 2 hours of dance 3 days a week would often only show up as maybe 30 minutes each day, and sometimes not at all. Those same practices (with an admittedly shorter 30 minute cap due to lack or stamina, thanks pandemic...) are being picked up in their entirety, even if my heartrate elevation is small, but enough to push it into registering in one of the "zones". This has helped a good deal in getting an overall portrait of my health and activity levels, which I'll be bringing to my doctor on my next visit. The only thing I have found is I haven't been able to get 6 days of battery life out of it, generally landing at 4-5 days. For me this isn't an issue as I don't wear my device to shower and have had a habit since my original Charge HR (way back in the day) of popping it on the charger whenever I shower. This may also be why I don't have any effect from the device or band as my wrist gets regular breaks. If you're primarily looking for a smart watch and just want something with some extra features, this will not be the device for you. While the extra health tracking is a great draw, it loses a lot of the functionality my old smart watch had, the notifications for things like texts don't always come through (which is fine for me because I don't want that) and the pay feature isn't fantastic. Again, that doesn't matter to me because it's a feature I don't intend to really use anyway, but had to test it out. The apps are limited, and options for music and taking calls aren't wonderful. On the other hand, if you're looking for a device to give you detailed health information, to accurately log fitness activities, and increased metrics for sleep, this may just be the device for you. It's the best fitness tracker I've seen so far, and this is giving my medical team some new information to work with, which may or may not be useful in the long run, but looks promising. That EDA quick scan had potential for people who suffer clinical anxiety or even PTSD as it can be used to cue deep breathing, and the resulting data may result in creating a better profile of what's going on during an attack, or at the very least can result in creating a cue to take specific actions in a way that simply feeling in the moment cannot. Not all of this data will be useful for everyone, but it could be useful for someone who needs this kind of data to help understand their sleep patterns, anxiety levels, how activity, even in small amounts of a few minutes here and there, impacts their mental health, or even just someone who wants an accurate profile of their physical fitness throughout their exercises. I was 100% resistant to the idea of yet another smart watch, but in the end I'm happy I made the switch. The added information I've gained has given me a lot more understanding of what's going on with me. I now have clues as to why nights I get plenty of quality sleep (according to previously going on just my sleep score) I wake up feeling tired, and I'm seeing a correlation with sleep temp particularly and low quality sleep. That 24/7 heartrate has been huge. I can now actually monitor my activity level instead of trying to track exercise my Charge missed (because I never turn on exercises prior to start as I never remember or can't figure out which fits best), and result in trying to figure out a routine that way. Everything is logged now, making it simple and accurate. The EDA scan is becoming a tool to manage my anxiety, and while the metrics may or may not be useful, it does cue activities which are useful, so even if it's no more than placebo effect, the end result is valuable. What you will get out of this device will be very personal and it depends on how you use it, and what you expect to get from it. The Fitbit Sense can be a useful tool for you and your medical team, or even you and your trainer, depending on your goals. This device is definitely not for everyone, and the price point does not make it worth it for every user, but if you're looking for a tool to track your health, this one seems to be the best on the market to date.
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Reviewed in the United States on February 27, 2021 by Sarasyn
Color: White/Gold
I bought the version that was in an open box like new for $120 and the watch is in perfect condition and exactly what I wanted. The battery needed charging but 24 hours after charging the watch only dropped 10 percent. I am extremely happy with the purchase and would definitely recommend others saving the money instead of buying unopened and new. I received the watch from the seller in record time. I don’t have prime but I still had it in five days. Now I’m at day three and the watch is still at 51 percent from the first time I charged it. Awesome
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Reviewed in the United States on June 25, 2025 by Rusty
Color: Sage Grey/Silver
I rarely feel compelled to write reviews because the products I usually get are 4-5 stars and I have nothing helpful to add to the review. In this case, I am furious (at FitBit) at how bad this flagship product is for anything involving exercise. tl;dr: heart rate tracking during exercise, lifting or cardio, is so busted it qualifies as false advertising. It was off 20-80 BPM during cardio. Can't even express my shock adequately over that. My background: I'm not an athlete, I'm a regular guy who enjoys lifting, hiking, spinning, and working out in general. I workout 4-5 times a week for 30-90 minutes per session unless I go for long hikes (3-6 hours). I know what my heart rate is when I work out. I've used a FitBit Alta HR for the past 4 years and I've sporadically used a Polar heart rate band around the chest. I know what various heart rate levels feel like in my body and can guess within +/- 10 BPM based on fingers to my neck or wrist. I've had this FitBit Sense for a week after retiring my Alta HR (still working!!!). In the four images, you'll see two different recent workouts. The first image is from 11 November with my Alta HR. I had just finished lifting weights (image 3) and went over to the elliptical and powered it up to resistance 45/100. My METS output was between 10-12 the entire time. You can see the Alta HR took a moment to catch up to my heart rate, but once it did, it was accurate. I really was going hard the entire time and ended the exercise before doing my cool-down. I can sustain my heart rate at 165+ during cardio for 30-60 minutes depending on what I'm doing. I've been able to do that for years. I know what a high heart rate feels like in my chest, in my neck, and on my wrist. The second image is from today, 25 November with my FitBit Sense. I had just finished lifting weights (image 4) and went over to the elliptical and powered it up to resistance 45/100 (sound familiar?). My METS output was between 10-12 the entire time (sound familiar?). Only this time, my Sense appeared to catch up and then it flatlined and reported me for 25 minutes between 82 and 89, which is so laughable it's actually criminal how wrong that is. I tested my heart rate using the machine itself (which is reliable within +/- 5 BPM) and it showed me at 165. I put my fingers to my neck and felt a pulse of around 160-170 (not a doctor or an EMT but I'm a musician and know the difference between 82 and 165 on the metronome). For weight lifting comparison, see images 3 and 4. I chose the same workout for comparison (upper body) and I am WELL aware that wrist-mounted HR monitors struggle with weight lifting because of hand grips changing the circulation of blood to the wrist. You can see in image 3 that I have peaks and valleys - my HR is going up right after doing the lift and it comes down during the 60-90 sec recovery. The Sense (image 4) struggled mightily, showing what appears to be a more "consistent" reading across but missing the peaks and valleys that weight lifting leads to. For more context, I was benching 185-225 during the first 8 minutes where it saw me in fat burn and I can tell you, my HR was well above 120ish after the set at 225. All of the other FitBit Sense features, so far, appear to be great. I like getting notifications on my wrist that I can choose to see, like having my various messaging apps notify me. I like the Star Trek Console clock face - kudos to the developer because it makes my nerdy side smile. I like that it measures SpO2 while sleeping. I like that I get excellent sleep tracking that compares very well to my old FitBit Alta HR. I like that I can input other metrics like my weight or stress into it with the Sense. I haven't yet tried the ECG or EDA, but I expect those probably work just fine too. The visual of the watch on my wrist is nice and people have already complimented it. But the fact that in November of 2021, more than a year after launching this flagship, $300 product that is meant to compete with the Apple Watch, Garmin Vivo series, and a suite of decent Samsung watches, more than a year after MANY online complaints about the heart rate monitor not working during exercise, for this to still be a problem indicates that something is actually wrong at FitBit itself. I work in a medium-sized corporation and if our flagship product was actively FAILING to do the ONE most basic function the entire company was LAUNCHED on, people would be getting fired left and right. I guarantee you that the engineering department likely has not received enough negative feedback about this. I'm sure this review will never be seen but it sure is making me feel better writing it. It's not only laughable, it's actively pathetic that a FitBit heart rate sensor in 2021 cannot accurately record a heart rate during exercise. My Alta HR, from 2017, was accurate. This thing was 20 to 80 BPM off. That is STUNNING. That is EMBARRASSING. That is FALSE ADVERTISING. No athlete, no gym rat, not even a regular person wearing one of these should even remotely trust any of the other readings the sensors provide if the most basic, most simple, most well-tested sensor since the mid 2000s, a heart rate sensor, isn't working right on a $300 flagship product. I mean it's so inexcusable I can't even believe I'm writing this. And real quick - the FitBit customer service representative claimed that "I wasn't wearing it right" (per FitBit's own instructions, I've been wearing the Alta HR above my wrist by two finger widths for 4 years and did the same with the Sense this past week). Then, he told me that I couldn't "claim" the warranty, after one week mind you, because I DARED to mention that I did a comparison with a Polar HR band. Somehow, mentioning that you know what you're talking about and can see the faults means you don't get a product replacement? Literally that's criminal behavior and FitBit should be shocked and embarrassed by that. I don't know who they contracted their customer service out to (and I won't indicate from what region this person likely was because there's no need for that), but wow. I've never had a worse customer experience over the phone in my LIFE. And I've had to deal with cable companies! But lemme give a quick shout out to my man Joshua, the Amazon representative. Five stars. He heard the whole conversation and he couldn't even believe the FitBit customer representative was actively avoiding trying to provide a replacement. And so he had my back and processed a refund.
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Reviewed in the United States on November 25, 2021 by Colin M Jones Colin M Jones
Color: White/Gold
I wrote a very negative review about this product on Saturday because I had not been able to get it to work. I had downloaded the app to my phone and tried several times to link the Fitbit without success. My original review is in parentheses. (I am assuming this is a one off because this Fitbit Sense was very highly rated. I ordered it because it is one of the models that can detect AFib. I have not been able to get it to work. I downloaded the app but the device does not respond to anything. Most of the time the screen is blank. When something does come up, it is simply an icon telling me to download the app, repeated in several languages. So I can't even use it as a watch or step tracker, let along monitoring my heart rhythm! I will be returning it.) After uninstalling and reinstalling the app three times, the device finally linked to it and started working as intended. I have not experienced an episode of Afib since getting the Sense Fitbit so I do not know if it will actually alert me when one is starting. The pedometer works well, keeping track of my steps and reminding me to move when I have been sitting too long. It tracked my sleep well last night and accurately displays my heart rate. After a very frustrating start, I am happy with my purchase.
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Reviewed in the United States on April 12, 2025 by Louisa May