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Fitbit

Fitbit Sense Advanced Smartwatch with Tools for Heart Health, Stress Management & Skin Temperature Trends, Sage Grey/Silver, One Size (S & L Bands Included)

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Availability: In Stock.
Fulfilled by Amazon
Arrives Tuesday, Apr 28
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Color: Sage Grey/Silver


Features

  • Optimize your workouts with a Daily Readiness Score that reveals if youre ready to exercise or should focus on recover (requires Fitbit Premium membership. Premium content recommendations are not available in all locales and may be in English only)
  • 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
  • With a compatible ECG app right on your wrist, assess your heart for atrial fibrillation--a heart rhythm irregularity--and share the results with your doctor (Only available in select countries. Not intended for use by people under 22 years old)
  • An on-wrist skin temperature sensor tracks yours each night so you can see how it varies
  • Includes a 6-month Premium membership complete with personalized insights, advanced analytics, guided programs and more (New & returning Premium users only. Must activate trial within 60-days of device activation. Content and features may change)
  • High & low heart rate notifications alert you if yours seems above or below your average
  • Battery lasts 6+ daysplus, fast charging gives you a full days 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
  • Small fits wrist 5.5" - 7.1" in circumference and Large fits wrist 7.1" - 8.7" in circumference

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.

Product Dimensions ‏ : ‎ 1.59 x 1.59 x 0.48 inches; 7.05 ounces


Item model number ‏ : ‎ FB512SRSG


Batteries ‏ : ‎ 1 Lithium Ion batteries required. (included)


Date First Available ‏ : ‎ August 16, 2021


Manufacturer ‏ : ‎ Fitbit Inc


Best Sellers Rank: #14,169 in Electronics (See Top 100 in Electronics) #36 in Heart Rate Monitors (Sports & Outdoors) #3,486 in Wearable Technology (Electronics)


#36 in Heart Rate Monitors (Sports & Outdoors):


#3,486 in Wearable Technology (Electronics):


Customer Reviews: 4.1 4.1 out of 5 stars (2,974)


Operating System: android


Additional Features: Time Display, Notifications, Heart Rate Monitor, Sleep Monitor, Menstural Health Tracking, Activity Tracker, Voice Assistant, Stress Tracking, ECG, Oxymeter (SpO2), Pedometer, Body Temperature Monitor, GPS


GPS Geotagging Functionality: Built-in GPS


Band Material Type: Silicone


Case Material Type: Acrylonitrile Butadiene Styrene (ABS)


Water Resistance Level: Water Resistant


Sport Type: Fitness


Closure Type: Buckle


Human Interface Input: Touchscreen


Clasp Type: Push Button Deployant Clasp


Supported Application: GPS


Water Resistance Depth: 50 Meters


Supported Satellite Navigation System: GPS


Metrics Measured: accelerometer, optical_heart_rate, ecg, spo2, gps


Brand: Fitbit


Model Name: Sense


Target Audience: Unisex Adult


Age Range Description: Adult


Model Number: FB512SRSG


Built-In Media: Band, Charging Cable, Device


Wearable Computer Type: Smart Watch


UPC: 811138036942


Manufacturer: Fitbit Inc


Unit Count: 1.0 Count


Warranty Description: 1 Year


Shape: Rectangular


Style Name: Modern


Color: Sage Grey/Silver


Band Color: grey


Battery Cell Type: Lithium Ion


Battery Average Life: 6 days


Battery Charge Time: 12 minutes


Connectivity Technology: Bluetooth


Wireless Compability: Bluetooth


Wireless Provider: du


Screen Size: 1.69 Inches


Display Type: Analog


Resolution: 4K


Maximum Display Brightness: 1000 Nit


Compatible Devices: Smartphone


Compatible Phone Models: All current iPhone models, All current Android models


Item Weight: 0.2 Kilograms


Item Dimensions: 1.59 x 1.59 x 0.48 inches


Memory Storage Capacity: 6400 MB


Warranty Type: Limited


Waterproof Rating: ip67


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Tuesday, Apr 28

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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Similar Products

Top Amazon Reviews

    • I like the original Fitbit Sense, So happy I was able to replace my first one
Color: Sage Grey/Silver
I like my Fitbit Sense. I like it a lot. I originally bought my first one in 2021. It worked very well. Then it stopped charging. I cleaned the contacts on the back of the watch. I tried several of my charging cords. It still wouldn't charge. One of my kids suggested that I consider getting a new smart watch that's made by a different company. I caved & purchased a new one since I thought my battery must have died in my watch. In the meantime, I also purchased a new charging cord for my old Fitbit Sense. It worked & my old Fitbit Sense charged perfectly. Uh oh! Lesson learned, thoroughly check all charging cords & charging blocks to device in question. Ugh! At that point, I then owned 2 fitness watches. I gave my daughter the old Fitbit Sense since it worked. My problem was that with the new competitioners fitness watch was that although it looked pretty cool, I really hated the app that was attached to it. I thought I would get used to it but I didn't. I really hated it's format which made the watch useless to me. It was more geared for an elite athlete, which I am not. My predicament was that I couldn't take back my old watch from my child, especially after she already bought watch bands & accessories. Unfortunately I wasn't going to keep the new watch. It was too expensive to have an app that didn't work for me. After checking around where I could buy a Fitbit sense original, I was sad to see that Fitbit stopped making the original anymore. I really liked my old Fitbit sense. The upgraded Sense 2 has omitted some features that I liked on the original. Luckily when I looked on Amazon I found they some in stock & I was able to purchase a new Fitbit Sense. I really do like the Fitbit Sense. I think it's a pretty good workhorse & I'm happy I found it. I know that in a near future it will be very difficult to find a new original one. I thought the price was pretty good. It was definitely less than the original one I owned previously. I wish there were some more features as far as watch faces but I'm pretty happy with it. I think it will last a long time. (fingers crossed) maybe when this one croaks, Fitbit/ Google will come up with another watch that includes all the features that I like. ... show more
Reviewed in the United States on February 27, 2024 by Zoobadoo
    • It works
Color: Sage Grey/Silver
It is great
Reviewed in the United States on April 3, 2026 by Carol J.Gutknecht
    • Splish splash this FitBit Sense is trash
Color: Sage Grey/Silver
Review Image by Colin M Jones
Review Image by Colin M Jones
Review Image by Colin M Jones
Review Image by Colin M Jones
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. ... show more
Reviewed in the United States on November 25, 2021 by Colin M Jones
    • Really good tracker with minimal battery issues
Color: Sage Grey/Silver
I've been using my Fitbit for a couple of weeks now and I know that I purposely bought an older model years after it originally came out. However, the battery life on this fitbit is dismal ( which I have read reviews about as well) i'm not a super active person, and I keep the mode set to where I have to manually turn the screen on so it's not constantly turning on all the time, and yet the battery will only last about 4-5 days. The functionality of the fitbit itself is great.It does a good job of tracking steps, sleep , oxygen levels, heart rate, etc. I do enjoy using it as it is helping keep me more accountable on my weight loss journey. Even with the battery issue, i would still recommend this fitbit to someone looking for a smartwatch/fitness tracker. ... show more
Reviewed in the United States on April 5, 2026 by Lindsey W.
    • Great Smartwatch With Emphasis on Fitness/Health
Color: Sage Grey/Silver
This Fitbit Sense smartwatch looks remarkably like the Apple Watch, both in design and in size, but of course it's tooled to the Fitbit platform. I like that it reminds you when to get up and walk around to keep you from being too sedentary. Although it's not entirely accurate with its step count -- you can wave your hand around and get steps -- it's much more accurate than earlier Fitbit wrist-worn products. (I used to have a Fitbit One that I carried in my pocket because it was more accurate than the wrist Fitbits.) It's easy to set up and use. This comes with a silicone band than can be easily swapped out for a mesh band from another company. I don't mind the silicone band, but others may prefer a dressier, more formal look to hide the fact that they are wearing a Fitbit. -- Debbie Lee Wesselmann ... show more
Reviewed in the United States on December 30, 2021 by Debbie Lee Wesselmann

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