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

4.2 4.2 out of 5 stars 845 ratings
Amazon's Choice highlights highly rated, well-priced products available to ship immediately.
Amazon's Choice in Smartwatches by Fitbit

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Blue Mist/Pale Gold
Ask to set a workout timer, check the weather, control smart home devices, and more with this device.
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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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Purchase options and add-ons

Brand Fitbit
Model Name Fitbit Sense 2
Style Modern
Color Blue Mist/Pale Gold
Screen Size 1.69 Inches
Special Feature Sleep Monitor, Stress Monitor, Sleep Monitor, ECG, Oxymeter (SpO2), Heart Rate Monitor, GPS, Time Display, Notifications, Water Resistant See more
Shape Heart
Target Audience Unisex Adult
Age Range (Description) Adult
Compatible Devices Smartphone

About this item

  • Learn to manage stress, sleep better and live healthier with Sense 2—our most advanced health and fitness smartwatch
  • 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
  • Designed for all-day wear: on-wrist Bluetooth calls, texts and phone notifications(6), customizable clock faces, Fitbit Pay(7), Amazon Alexa built-in(8), Google Wallet & Maps (Google Maps on Android only, coming Spring 2023 to iOS), 6+ day battery(9)
  • 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)

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From the manufacturer

Sense 2 copy over an image of a woman holding a phone
sense 2 watch on cream colored background

Shop the Fitbit Collection

Fitbit Sense 2

Sense 2

Fitbit Versa 4

Versa 4

Fitbit Charge 5

Charge 5

Fitbit Luxe

Luxe

Fitbit Inspire 3

Inspire 3

Customer Reviews
4.2 out of 5 stars
3,610
4.3 out of 5 stars
9,798
4.1 out of 5 stars
31,023
4.3 out of 5 stars
9,604
4.4 out of 5 stars
11,498
Price
$199.95 $149.95 $129.00 $129.95 $99.95
Battery life (in days)
6 6 7 5 10
Steps, distance & calories
24/7 heart rate & AZM
Built-in GPS
Yes Yes Yes Connected GPS Connected GPS
Sleep tracking & sleep stages
Sleep Profile & Sleep Score
Blood Oxygen (SpO2)
Stress Management Score
All-day body response tracking
ECG app for Afib detection
Call, text & app notifications
Alexa built-in
Fitbit logo over top an image of a woman running

Product 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 Amazon.com, 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.

Product details

  • Product Dimensions ‏ : ‎ 1.57 x 0.47 x 1.57 inches; 7.04 ounces
  • Item model number ‏ : ‎ FB521GLBM-US
  • Batteries ‏ : ‎ 1 Lithium Ion batteries required. (included)
  • Date First Available ‏ : ‎ September 23, 2022
  • Manufacturer ‏ : ‎ Fitbit Inc
  • ASIN ‏ : ‎ B0B4MV1TGL
  • Customer Reviews:
    4.2 4.2 out of 5 stars 845 ratings

Product guides and documents

Compare with similar items

This Item
Fitbit Sense 2 Advanced Health and Fitness Smartwatch with Tools to Manage Stress and Sleep, ECG App, SpO2, 24/7 Heart Rate and GPS, Blue Mist/Pale Gold, One Size (S & L Bands Included)
Fitbit Sense 2 Advanced Health and Fitness Smartwatch with Tools to Manage Stress and Sleep, ECG App, SpO2, 24/7 Heart Rate and GPS, Blue Mist/Pale Gold, One Size (S & L Bands Included)
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Price-33% $199.95
List:$299.95
-40% $132.00
New Price:$219.00
-33% $199.95
List:$299.95
-5% $169.99
Typical:$179.00
-25% $149.95
List:$199.95
Delivery
Get it as soon as Friday, May 17
Customer Ratings
Battery life
3.9
3.9
4.2
4.8
4.0
Sleep tracking
3.9
4.0
4.1
5.0
3.9
Mobile App
3.6
4.0
4.0
5.0
3.8
Accuracy
3.6
3.7
4.3
Value for money
3.3
3.2
1.6
Sold By
Amazon.com
Hot Audio
Amazon.com
Stavvy Sales
Amazon.com
operating system
ios
ios
ios
display size
1.69 inches
1.34 inches
1.69 inches
1.34 inches
1.69 inches
connectivity tech
Bluetooth
GPS
Bluetooth
Bluetooth
Ethernet
supported applications
GPS, Phone, Voice Assistant
Voice Assistant
GPS, Sleep Monitor
GPS, Phone
GPS, Phone
input interface
touch screen
microphone
touch screen
touch screen
touch screen stylus pen
wireless standard
bluetooth
bluetooth
bluetooth
bluetooth
bluetooth

Important information

Wattage

180 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

4.2 out of 5 stars
4.2 out of 5
845 global ratings

Customers say

Customers like the appearance of the wearable computer. However, some customers have compatibility issues with the watch and app. They mention that the sync is hit or miss, hard to pair, and doesn't properly sync. Customers also have issues with charge. Opinions are mixed on ease of set up, battery life, performance, quality, and heart rate tracking.

AI-generated from the text of customer reviews

11 customers mention11 positive0 negative

Customers are satisfied with the appearance of the wearable computer. They mention that it has a fancy graphics, a soft gold color, and a metal alloy embedded in the display.

"...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...." Read more

"...This one had everything I wanted and more! I love the style, I love the stress monitor, as well as all the other options available...." Read more

"...It looks great in this very light blue color with the soft gold frame. 5-6 days between charges...." Read more

"I really wanted to love this product! It has a lovely color screen display with some fancy graphics...." Read more

57 customers mention29 positive28 negative

Customers are mixed about the quality of the wearable computer. Some mention it's a good product, while others say it'll never be better than the first.

"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...." Read more

"...So it's a good watch. It's just not better than the first." Read more

"...I've had Fitbits for years. Durable and reliable." Read more

"Wish the screen was more heavy duty. I do like the style and uses of the wach along with the app" Read more

39 customers mention22 positive17 negative

Customers are mixed about the heart rate tracking. Some mention that it's a great help along with tracking exercising and sleep, and the watch is great to track activity. However, others say that it rarely tracks the actual heart rate or keeps track of your sleep. It also has a long time lag and does not track steps accurately when they do pool exercises.

"...I do love having these watches on my wrist and being able to track my pathetic steps and sleep...." Read more

"...Haven't allowed it to go less than 20%.It does not track steps accurately when I do pool exercises...." Read more

"Does all it is suppose to. I am able to track my sleep and heart beat. I also use it for steps and exercise.Works great with the fitbit app." Read more

"Keeps track of everything!!" Read more

37 customers mention12 positive25 negative

Customers have mixed opinions about the performance of the smartwatch. Some say that it works well, while others say that they had issues with it malfunctioning.

"...One day i took it off yo give my kids a bath and the next the unit wouldn't start after multiple attempts to charge it...." Read more

"...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...." Read more

"...At 6 months, the sleep cardiac arrythmia alert stopped working. Also the light started coming on every time I moved in bed...." Read more

"...Fitbit Wallet was retired but there is a common bug that makes Google Wallet not work...." Read more

27 customers mention14 positive13 negative

Customers are mixed about the battery life of the wearable computer. Some mention it has great battery life and charges very quickly, while others say it does not last 6 days, dies after 15 days, and is impossible to keep charged. The battery is bad and dies constantly. It starts turning off randomly and the feature drains lots of battery. The watch needs charging often and keeps shutting down and restarting.

"...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...." Read more

"Very disappointed on my fitbit Sense 2, completely died without warning. I didn't drop it, hit it in any way...." Read more

"We love our Sense 2 Fitbits. Best part is the battery last for sometimes 6 days...." Read more

"...I could not find any way to get the light to turn off. This used up the battery plus made sleep impossible...." Read more

25 customers mention12 positive13 negative

Customers are mixed about the ease of set up. Some mention it's relatively easy to set up and use, while others say it'll stick to their Garmin. The instructions are not clear, and the product is too complicated.

"...It was relatively easy to set up...." Read more

"...It was a bit challenging to set some things up. I still have some trouble with the weather synching but it usually works really well...." Read more

"...It monitors my heart rate well, and ECGs are easy to do. You can’t have a case on if you want to do ECGs though. Overall it’s a mixed bag...." Read more

"Kind of challenging to figure out. Then it went blank and had some weird flashing lights...." Read more

9 customers mention0 positive9 negative

Customers are dissatisfied with the charge of the wearable computer. They mention that it never charges and doesn't work at all.

"...Long battery life too.But now I can't charge it. I tried super glue but it keeps falling off. I will continue to try putting it back on...." Read more

"I had my Fitbit Sense 2 not even 2 years and it just stopped charging...." Read more

"...Works great when working. But not after 5 weeks. It wouldn't take a charge which meant it didn't work at all...." Read more

"...After realizing that the watch would not charge and or wouldn't connect to phone I went through the process to return the watch...." Read more

8 customers mention0 positive8 negative

Customers have mixed opinions about the compatibility of the wearable computer. Some mention that the sync is hit or miss, hard to pair, and doesn't properly sync 90% of the time. They also have trouble with the weather synching and that it's not compatible with Spotify. Some say that it tracks work outs accurately, but does not display the right time.

"...I still have some trouble with the weather synching but it usually works really well. My one big complaint just came up this week...." Read more

"...The watch has problems syncing with the app, some measurements seem to randomly come and go, and attempts to restart the watch may end up killing..." Read more

"...This model is simply not compatible with Spotify. Why? Who knows! It just not make sense.For the rest of the features, they are ok" Read more

"...I upgraded to a Sense 2 and it's awful. It's is hard to pair and doesn't properly sync 90% of the time...." Read more

Works just like the “other”
5 Stars
Works just like the “other”
I needed a new smart watch and did some research. I didn’t want to pay a ton of money. This one had everything I wanted and more! I love the style, I love the stress monitor, as well as all the other options available. The battery lasts forever. My only dislike is the band, I can’t wear it at night because my skin needs a break. But it’s the same with any of the smart watches.
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Top reviews from the United States

Reviewed in the United States on November 29, 2023
Color: Blue Mist/Pale GoldVerified Purchase
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.
13 people found this helpful
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Reviewed in the United States on September 17, 2023
Color: Blue Mist/Pale GoldVerified Purchase
If you have a Sense 1, I don't recommend upgrading it to the 2 because it's not actually better. My Sense 1 was able to pick up right away when I started walking and would log that automatically. The Sense 2 barely picks up 7-11 minutes into my exercise that I'm walking, and even then I've usually been walking longer than my watch detected. If you get two texts at once, the watch only shows you one, unless you quickly dismiss the first one. But otherwise, unless you have your phone on your body, you won't know through the watch that you got two texts to begin with.
So it's a good watch. It's just not better than the first.
13 people found this helpful
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Reviewed in the United States on April 10, 2024
Color: Blue Mist/Pale GoldVerified Purchase
We love our Sense 2 Fitbits. Best part is the battery last for sometimes 6 days. I like the look of the pixel watches but with on a 24 hour battery, that was a non starter. I've had Fitbits for years. Durable and reliable.
One person found this helpful
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Reviewed in the United States on March 29, 2024
Color: Blue Mist/Pale GoldVerified Purchase
I really loved my Fitbit Versa 2, but they don't seem to be making it anymore. Mine lasted over 2 years. Took me awhile to figure out this Sense 2 and I still don't use a lot of the options, but I use it for what I need it for. I do love having these watches on my wrist and being able to track my pathetic steps and sleep. I miss being able to put a picture on the screen for special occasions also.
One person found this helpful
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Reviewed in the United States on September 21, 2023
Color: Blue Mist/Pale GoldVerified Purchase
Very disappointed on my fitbit Sense 2, completely died without warning. I didn't drop it, hit it in any way. One day i took it off yo give my kids a bath and the next the unit wouldn't start after multiple attempts to charge it. I had no problems prior, i thought it worked great. Hoping i guet my full refund.
17 people found this helpful
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Reviewed in the United States on April 10, 2024
Color: Blue Mist/Pale GoldVerified Purchase
This lasted working well for 6 months. At 6 months, the sleep cardiac arrythmia alert stopped working. Also the light started coming on every time I moved in bed. That progressed to the light coming on and not going off all night. I could not find any way to get the light to turn off. This used up the battery plus made sleep impossible. The sleep function never was all that accurate, because it would say I was in light sleep when actually I was awake reading. Things that worked are the EKG and the step counting. The cardiac arrythmia function did seem to come back online after a couple of months. Since I was always in normal sinus rhythm, I can't really say much about it. But I no longer use the watch because of the light coming on and staying on all night. I use a Kardia Mobile to check for heart arrythmia during the day, and use nothing during the night. Could have saved myself a couple hundred dollars on this.
One person found this helpful
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Reviewed in the United States on April 7, 2024
Color: Blue Mist/Pale GoldVerified Purchase
This is really nice. The Alexa works well and the battery lasts a long time!
Reviewed in the United States on March 17, 2024
Color: Blue Mist/Pale GoldVerified Purchase
I was torn between getting another Fitbit or get a Galaxy watch. In the end I stayed with Fitbit despite the dismal durability of the previous ones I've owned. I averaged a new one every other year. The Galaxy has some great features, but I found out that the newest one isn't compatible with the version of my phone, and my phone isn't able to update anything newer. Since the previous version was more expensive than this Fitbit Sense that pushed me to purchase it. As well as a sale on the blue color I wanted that took $50 off. So with that savings I purchased the 2 yr extended warranty to address that part of my hesitation. It was a bit challenging to set some things up. I still have some trouble with the weather synching but it usually works really well. My one big complaint just came up this week. The 2 sensors on the back seem to have burned my wrist. It is clearly 2 dots. I never felt it as it happened, but the marks are there and though I switched it temporarily to my other wrist so it can heal I'm a little worried about how or why this could have happened. I'd worn it on that wrist since the end of Feb, but it just happened. So far in a few days my other wrist is ok but the marks still haven't healed on the other.
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Jeff Wilson
5.0 out of 5 stars Great comunication device
Reviewed in Australia on December 18, 2023
Color: Blue Mist/Pale GoldVerified Purchase
This is a great product. We are very familiar with it, and it works smoothly with the existing Fitbit app on our phones.
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Jeff Wilson
5.0 out of 5 stars Great comunication device
Reviewed in Australia on December 18, 2023
This is a great product. We are very familiar with it, and it works smoothly with the existing Fitbit app on our phones.
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Amazon Customer
4.0 out of 5 stars fitness
Reviewed in Australia on March 3, 2024
Color: Blue Mist/Pale GoldVerified Purchase
i like the feel and accuracy of the watch, also easy to read txt messages
Dan
4.0 out of 5 stars Buena compra
Reviewed in Mexico on July 31, 2023
Color: Blue Mist/Pale GoldVerified Purchase
La pantalla se ve muy bien, el diseño es bonito y si dura una semana la pila (también carga rápido).

Detecta bien el ritmo cardíaco en reposo (aún no reviso si lo hace bien cuando hago ejercicio) y la oxigenación solo te da un estimado por la mañana de cuando duermes. He notado que a veces no detecta bien cuando despierto.

Las funciones de la app están bien, son buenas. Lo malo es que no se puede conectar a Spotify, WhatsApp ni se pueden hacer llamadas. Solo de puede contestar las llamadas en el reloj y ver las notificaciones de sms o mail o conectar a Google maps desde el teléfono y ver las instrucciones en el reloj.

Algo que sirve como tip es que cuando te laves las manos o si te bañas con el procura quitartelo y secar bien todo, a mi me estaba irritado la piel si se quedaba un poco húmedo.

Estoy conforme con la compra ya que lo que más buscaba era un reloj que me ayudara a darme una idea de cómo esta mi frecuencia cardíaca y oxigenación.
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Dan
4.0 out of 5 stars Buena compra
Reviewed in Mexico on July 31, 2023
La pantalla se ve muy bien, el diseño es bonito y si dura una semana la pila (también carga rápido).

Detecta bien el ritmo cardíaco en reposo (aún no reviso si lo hace bien cuando hago ejercicio) y la oxigenación solo te da un estimado por la mañana de cuando duermes. He notado que a veces no detecta bien cuando despierto.

Las funciones de la app están bien, son buenas. Lo malo es que no se puede conectar a Spotify, WhatsApp ni se pueden hacer llamadas. Solo de puede contestar las llamadas en el reloj y ver las notificaciones de sms o mail o conectar a Google maps desde el teléfono y ver las instrucciones en el reloj.

Algo que sirve como tip es que cuando te laves las manos o si te bañas con el procura quitartelo y secar bien todo, a mi me estaba irritado la piel si se quedaba un poco húmedo.

Estoy conforme con la compra ya que lo que más buscaba era un reloj que me ayudara a darme una idea de cómo esta mi frecuencia cardíaca y oxigenación.
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Tay
1.0 out of 5 stars Pésimo reloj
Reviewed in Mexico on March 10, 2023
Color: Blue Mist/Pale GoldVerified Purchase
Es el peor reloj que he comprado.
No vale la pena tirar su dinero en un device que no sirve. Nou hay apoyo por parte de soporte. Tengo 4 meses con el y ya no funciona, empezó a fallar demasiado desde los 2 meses.
Jamás volveré a comprar fitbit
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Salomon
3.0 out of 5 stars Ciertas funciones no sirven en mexico
Reviewed in Mexico on September 30, 2023
Color: Blue Mist/Pale GoldVerified Purchase
La batería no dura lo que dicen y tiene funciones que en médico no sirven

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