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Fitbit

Fitbit Sense 2 Advanced Health and Fitness Smartwatch with Tools to Manage Stress and Sleep, ECG App, SpO2, 24/7 Heart Rate and GPS, Shadow Grey/Graphite, One Size (S & L Bands Included)

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This item's return window has been extended for the holiday season: Returnable until Jan 31, 2026

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Availability: Only 1 left in stock, order soon!
Fulfilled by Heart Rate Monitors USA
Arrives Tuesday, Dec 9
Order within 2 hours and 14 minutes
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Color: Shadow Grey/Graphite


Features

  • Learn to manage stress, sleep better and live healthier with Sense 2our most advanced health and fitness smartwatch.Human Interface Input: Touchscreen
  • Manage stress and live healthier: all-day stress detection with cEDA and daily Stress Management Score, ECG app for atrial fibrillation assessment(1), irregular heart rhythm notifications(2), SpO2(3), health metrics dashboard(4), mindfulness content
  • Measure and improve sleep quality: personalized Sleep Profile(5), daily sleep stages & Sleep Score, smart wake alarm and do not disturb mode
  • Enhance activity: built-in GPS and workout intensity map, Daily Readiness Score(5), Active Zone Minutes, all-day activity tracking and 24/7 heart rate, 40+ exercise modes and automatic exercise tracking, water resistant to 50 meters
  • Sense 2 is sleek and slim with raised band attachments that make it more comfortable for all-day wear. Both small and large sizes included in box. Small: Fits wrist 5.1 - 7 inches in circumference. Large: Fits wrist 6.5 - 8.6 inches in circumference
  • Includes a 6-month Premium membership complete with personalized insights, advanced analytics and more (New & returning Premium users only. Must activate trial within 60-days of device activation. Content and features may change)

Description

Meet Sense 2—the smartwatch designed to help you stress less, sleep better & live healthier. Fitbit is part of the Google family. 1) The Fitbit ECG app is only available in select countries and with select devices. Not intended for use by people under 22 years old. See fitbit.com/ecg for additional details. 2) Irregular rhythm notifications are only available in select countries and with select Fitbit products; not intended for use by people under 22 years old or with other known arrhythmias. See fitbit.com/irregularrhythm for additional details. 3) Not available in all markets. The SpO2 feature is not intended to diagnose or treat any medical condition or for any other medical purpose. It is intended to help you manage your well-being and keep track of your information. 4) The Health Metrics dashboard and the metrics displayed in the dashboard are not available in all countries. This feature should not be relied on for any medical purposes. It is intended to provide information that can help you manage your well-being. The SpO2 feature requires more frequent charging. 5) Requires a Fitbit Premium membership. Premium content recommendations are not available in all locales and may be in English only. 6) When phone is nearby. 7) See bank and transit availability at fitbit.com/fitbit-pay/banks 8) Amazon, Alexa and all related marks are trademarks of , Inc. or its affiliates. Alexa is not available in all languages and countries. Alexa features and functionality may vary by location. 9) Varies with use and other factors. Up to 12 hours with continuous GPS. Get 24 hours of charge with 12 minutes of charging. 10) 6 months of Premium for New Premium users only. Must activate with device. Valid payment method required. Free trial must be activated within 60 days of device activation. Cancel before free trial ends to avoid subscription fees. Requires use of Fitbit app with compatible iPhone or Android devices. A Google account will be required.

Operating System: Android


Memory Storage Capacity: 4 GB


Special Feature: Activity Tracker, Stress Tracking, Sleep Monitor, ECG, Heart Rate Monitor, GPS, Notifications, Phone Call, Text Messaging, Bluetooth See more


Battery Capacity: 162


Connectivity Technology: Bluetooth


Wireless Communication Standard: Bluetooth


Battery Cell Composition: Lithium Ion


GPS: Built-in GPS


Shape: Square


Screen Size: 1.58 Inches


Product Dimensions ‏ : ‎ 1.57 x 0.47 x 1.57 inches; 6.74 ounces


Item model number ‏ : ‎ FB521


Department ‏ : ‎ mens


Batteries ‏ : ‎ 1 LR44 batteries required. (included)


Date First Available ‏ : ‎ September 23, 2022


Manufacturer ‏ : ‎ Fitbit Inc


Best Sellers Rank: #534 in Electronics (See Top 100 in Electronics) #22 in Smartwatches


#22 in Smartwatches:


Customer Reviews: 4.2 4.2 out of 5 stars 9,142 ratings


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Tuesday, Dec 9

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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Top Amazon Reviews

    • Easy to customize the app and watch to my needs
Color: Shadow Grey/Graphite
I purchased this watch primarily for its continuous heart monitoring, ECG app, sleep monitoring, plus some basic fitness like steps and stairs. It was easy to install. I was pleased to be able to turn off the GPS and Alexa which may have been good for an extra day of battery life. I was able to turn off the fitness nags. I've been running and working out over 40 years and don't need nags. I was also able to skip the Premium service since I don't want a monthly bill and don't want other nagging. There are a huge number of watch faces available. I focused only on free watch faces. One thing that wasn't clear is that apparently you can only install 6 faces on the watch. When I found a better choice, it wouldn't install and had no useful explanation of why not. I ended up looking specifically for watch faces that included a battery indicator (surprisingly not universal!) and basic fitness figures. The hard part was finding watch faces that increased the font size of the battery % and fitness figures so they were more easily legible to older eyes. The biggest problem is with the watch band. I have a narrow wrist and bands with holes like the OEM band are never spaced in a way that fits well. So I ordered a new band that is metal mesh and uses a clamp to fix the length. That works to get a comfortable fit, but is a pain to put on. Good thing I only take the watch off once a day! So I tried another watch band that had a folding clasp, like my old watch band, and is adjusted in length by removing links. The whole process of removing links was a serious pain, requiring a magnifying ring light and great patience. And the link removal did not yield a snug and comfortable fit, just as with the OEM watch band. Back to the band that works, for now. Update. I just discovered it is possible, apparently, to get an adapter from my old watch band that attaches to the watch with pins to the FitBit clamp system. I'm hoping that will allow me to use my old watch band which was excellent. Further update: https://www.amazon.com/dp/B0BN1RVM5W?psc=1&ref=ppx_yo2ov_dt_b_product_details This adapter took a long time to arrive all the way from China, but it worked perfectly. My old watch band was a 20mm band with adjustable sizing clamp and a folding clasp to take it on and off: https://www.amazon.com/gp/product/B08CY5D2LB/ref=pe_2313400_740551120_em_1p_0_lm?th=1 Now I have the best of all worlds. A good watch and it is easy to put on and take off with a snug fit. I wonder why no one seems to make this style of watch band specifically to fit the FitBit? ... show more
Reviewed in the United States on June 14, 2023 by J.R.
    • Very affordable for how much it offers
Color: Shadow Grey/Graphite
This Fitbit smartwatch is a great deal for how much it offers. Our purpose for purchasing these are to keep track of our Heart Health...a great plus is that we are able to share records with our doctor. The size is great, I am able to keep track of time without needing glasses. We love that we are able to keep track of our sleep patterns, do an ECG and so much more ...it focuses on how each individual body functions (great thing about smart watches) rather then using general information. The one downside about this....it requires a subscription. Now it comes with a free 6month premium subscription.... it's loaded with helpful action suggestions to keep your mind body and spirit strong. I believe the cost after the 6 month free trial is $79 a year ...but well worth it for all the potential health benefits. We like things simple ...and even though it we are still figuring things out ...this smartwatch is pretty simple to maneuver through. ... show more
Reviewed in the United States on October 5, 2025 by *Faith*Love*
    • Beautiful Tracker, Great Features, No Problems Using in the Pool
Color: Blue Mist/Pale Gold
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. ... show more
Reviewed in the United States on November 29, 2023 by ANNEE
    • Life changing product if you want to get better at fitness
Color: Shadow Grey/Graphite
This thing has changed my life for the better. I used to worry about my heart rate too much after I had heart surgery to fix AFIB, with this thing I can track it IN REAL TIME, ALL THE TIME, unlike the Apple Watch. The app is fantastic, so much data to mull over and improve on every single day. I never thought I’d get into cardio, but now I jog everyday to see how much further I can advance in heart rate, steps, miles, time, etc. It’s a wonderful product! However, there are a few quality control issues. The auto dim/screen brightness setting does not work after 3 days of ownership. Baffling. Sometimes the timer stops refreshing, making it appear the watch software has frozen, but it comes back to life after pressing the button. The UI could be smoother. 5 stars for the fitness tracking abilities, 3-4 stars for quality control issues. ... show more
Reviewed in the United States on August 27, 2025 by Phil

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