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

4.1 4.1 out of 5 stars 2,758 ratings

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Sage Grey/Silver

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About this item

  • Optimize your workouts with a Daily Readiness Score that reveals if you’re 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+ 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)
Ask to set a workout timer, check the weather, control smart home devices, and more with this device.
Alexa Built-in Learn more

Alexa Built-in

This device has been certified by Amazon. With Alexa built-in, just ask to set a timer, check the weather, control smart home devices, and more.

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From the manufacturer

fitbit sense
Fitbit Sense
two fitbit sense smartwatches on a black gradient background

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Customer Reviews
4.2 out of 5 stars
12,636
4.4 out of 5 stars
15,264
4.6 out of 5 stars
33,157
4.3 out of 5 stars
56,865
4.3 out of 5 stars
11,846
Battery life (in days)
6+ 6+ 6+ 7 10
Water resistance
50m 50m 50m 50m 50m
Tracks activity & sleep
24/7 heart rate & AZM
Text, call & app notifications
Play music
Hundreds of apps & clock faces
Alexa & Google Assistant
Yes Yes Alexa Built-in No No
Built-in GPS
Stress tracking w/ EDA sensor
ECG app & skin temperature
High & low heart rate alerts

Product 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 details

  • 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
  • ASIN ‏ : ‎ B09B7W8K38
  • Customer Reviews:
    4.1 4.1 out of 5 stars 2,758 ratings

Product guides and documents

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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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Price-29% $177.99
List:$249.95
$98.95$199.00-17% $249.95
List:$299.95
$199.95-25% $149.99
List:$199.99
Delivery
Get it as soon as Monday, Apr 1
Get it Apr 2 - 4
Get it as soon as Monday, Apr 1
Get it as soon as Monday, Apr 1
Customer Ratings
Sleep tracking
3.8
3.9
4.1
4.1
3.9
4.1
Mobile App
3.7
4.0
3.8
4.0
3.8
4.1
Battery life
3.8
4.5
4.2
4.0
4.2
Accuracy
3.4
3.8
4.1
3.7
4.3
Sold By
FiveStar Depot
Amazon.com
Safe 'N Quick
Amazon.com
Amazon.com
Amazon.com
size
1 Count (Pack of 1)
Adjustable
One Size
operating system
android
android
ios
ios
display size
1.69 inches
1968.51 inches
1.69 inches
1.69 inches
1.3 inches
connectivity tech
gps
Bluetooth
Bluetooth
Ethernet
VGA
supported applications
GPS
Sleep Monitor, Heart Rate Monitor, Alarm, Phone, Fitness Tracker, Reminders
GPS
GPS, Sleep Monitor
GPS, Phone
GPS
input interface
touch screen
touch screen
touch screen
touch screen
touch screen stylus pen
touch screen
wireless standard
bluetooth
bluetooth
bluetooth
bluetooth
bluetooth
bluetooth

Important information

Wattage

40 watts

Legal Disclaimer

Statements regarding dietary supplements have not been evaluated by the FDA and are not intended to diagnose, treat, cure, or prevent any disease or health condition.

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Customer reviews

4.1 out of 5 stars
4.1 out of 5
2,758 global ratings
Splish splash this FitBit Sense is trash
1 Star
Splish splash this FitBit Sense is trash
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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Vasii Sebastian
4.0 out of 5 stars Tante funzioni e comodo al polso
Reviewed in Italy on August 25, 2022
Color: Sage Grey/SilverVerified Purchase
2 people found this helpful
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ISMAEL VEGA
5.0 out of 5 stars Muy padre el diseño!
Reviewed in Mexico on June 22, 2022
Color: Sage Grey/SilverVerified Purchase
3 people found this helpful
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DONYLY ARROBA
5.0 out of 5 stars Diseño muy bonito, es práctico y muy fácil de usar
Reviewed in Mexico on August 2, 2022
Color: Sage Grey/SilverVerified Purchase
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DONYLY ARROBA
5.0 out of 5 stars Diseño muy bonito, es práctico y muy fácil de usar
Reviewed in Mexico on August 2, 2022
Es el segundo smartwhatch de la marca fitbit que tengo y me encanta, ese modelo es muy actual, diseño muy bonito, la app es muy fácil de usar.
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Francesco
4.0 out of 5 stars Ottimo Hardware, ma software insufficiente
Reviewed in Italy on September 6, 2023
Color: Sage Grey/SilverVerified Purchase
12 people found this helpful
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4.0 out of 5 stars Sehr zufrieden
Reviewed in Germany on February 12, 2024
Color: Sage Grey/SilverVerified Purchase

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