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Product Description

Meet the all-new Fitbit Flex 2—a slim, swim-proof fitness wristband that’s ready to go wherever life takes you. The ultra-thin, removable tracker hides in bands, bangles and pendants, so you can wear it in a way that’s all your own. Automatic all-day activity and sleep tracking show you how your entire day adds up, and SmartTrack automatic exercise recognition records your exercises for you. The discreet progress display uses color-coded LED lights to keep you connected to calls, texts and Reminders to Move. Plus you don’t have to worry about getting it wet—whether you’re swimming in the pool or running in the rain. It’s the next generation model of our most iconic tracker. No fuss, all fun, and fit for every you.

Manufacturer Contact Information

Customers contact: support@fitbit.com

Product details

Is Discontinued By Manufacturer ‏ : ‎ No
Product Dimensions ‏ : ‎ 10 x 0.45 x 0.37 inches; 0.64 ounces
Item model number ‏ : ‎ FB403BK
Department ‏ : ‎ womens
Batteries ‏ : ‎ 1 CR2 batteries required. (included)
Date First Available ‏ : ‎ August 16, 2016
Manufacturer ‏ : ‎ Fitbit Inc
ASIN ‏ : ‎ B01KH2PV4U

Best Sellers Rank: #250,911 in Sports & Outdoors (See Top 100 in Sports & Outdoors)
- #646 in Activity & Fitness Trackers

Customer Reviews:
5,360 ratings

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Keep it Clean: Regularly clean your band and wrist—especially after working out or sweating. Rinse the band with water or wipe it with a small amount of rubbing alcohol. Do NOT use hand soap, body soap, dish soap, hand sanitizers, cleaning wipes or household cleaners which could get trapped beneath the band and irritate skin. Always dry the band well before putting it back on. Keep it Dry: While Fitbit devices are water resistant*, it’s not good for your skin to wear a wet band for long periods of time. If your elastomer band gets wet—like after sweating or showering—rinse and dry it thoroughly before putting it back on your wrist. Be sure your skin is dry before you put your band back on. Don’t Wear It Too Tight: Make sure your band isn’t too tight. Wear the band loosely enough that it can move back and forth on your wrist. If you use Fitbit products with Purepulse Heart Rate tracking, for better heart rate readings during exercise, we suggest wearing the band so it’s secure, but not too tight, and wearing the band higher on your wrist (about 2-3 finger widths above your wrist bone). Lower the band on your wrist and loosen it after exercise. Give Your Wrist a Rest: Prolonged rubbing and pressure may irritate the skin, so give your wrist a break by removing the band for an hour after extended wear. Keep it Clean: Regularly clean your band and wrist—especially after working out or sweating. Rinse the band with water or wipe it with a small amount of rubbing alcohol. Do NOT use hand soap, body soap, dish soap, hand sanitizers, cleaning wipes or household cleaners which could get trapped beneath the band and irritate skin. Always dry the band well before putting it back on. Keep it Dry: While Fitbit devices are water resistant*, it’s not good for your skin to wear a wet band for long periods of time. If your elastomer band gets wet—like after sweating or showering—rinse and dry it thoroughly before putting it back on your wrist. Be sure your skin is dry before you put your band back on. Don’t Wear It Too Tight: Make sure your band isn’t too tight. Wear the band loosely enough that it can move back and forth on your wrist. If you use Fitbit products with Purepulse Heart Rate tracking, for better heart rate readings during exercise, we suggest wearing the band so it’s secure, but not too tight, and wearing the band higher on your wrist (about 2-3 finger widths above your wrist bone). Lower the band on your wrist and loosen it after exercise. Give Your Wrist a Rest: Prolonged rubbing and pressure may irritate the skin, so give your wrist a break by removing the band for an hour after extended wear.

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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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5,360 global ratings

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Customers find the Fitbit Flex 2 works well with both iOS and Android devices, is easy to manage and put on, and appreciate its small, slim design. The device is waterproof, allowing swimming and shower use, and customers consider it a great deal for a fitness tracker. However, the battery life is criticized for lasting only 3-4 days, and while some find it reliable, others report it breaking within 34 days of owning it. Sleep tracking accuracy and value for money receive mixed reviews.

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Functionality Size Waterproof Ease of use Sleep tracker Value for money Durability Battery life

769 customers mention "Functionality"578 positive191 negative

Customers find that the Fitbit Flex 2 functions well, particularly noting its compatibility with both iOS and Android devices.

"...It worked great, better than hoped for. My first clue that this was a quantum improvement came after the first gym visit wearing the Fitbit2...." Read more

"...The device itself did seem to be functioning properly..." Read more

"...will accurately track your # of laps, I'm convinced that this one works flawlessly..." Read more

"...It's one of the few items I want to use...and it FAILS...." Read more

321 customers mention "Size"295 positive26 negative

Customers like the size of the Fitbit Flex 2, describing it as small and slim, with one customer noting it's smaller than the previous version.

"...PROS: Slim and minimalist design Durable band Waterproof pebble Strong, effective vibrations (alarms, notifications)..." Read more

"...The new clasp is also made better as there are lips to keep the metal clasps engaged with the band, and it is a tighter clip as well...." Read more

"...I love how small it is and the fact that the lights are not super bright and they do not turn on when you flick your wrists...." Read more

"...Very comfortable on the wrist. * Slim, not bulky. * Like the feature when it buzzes when I get calls. *..." Read more

306 customers mention "Waterproof"293 positive13 negative

Customers appreciate that the Fitbit Flex 2 is waterproof, allowing them to wear it while swimming, showering, and even water skiing.

"...The app is superb, the Fitbit is tiny, water resistant, and holds a good charge. The band is nice too...." Read more

"...GREAT for swimming laps. No need to wear a separate swimming watch. 3. Update process was smooth 4...." Read more

"...for swimmers who are considering this device since it's the only swim-able (or at least swim certified) Fitbit available...." Read more

"...PROS: Slim and minimalist design Durable band Waterproof pebble Strong, effective vibrations (alarms, notifications)..." Read more

250 customers mention "Ease of use"197 positive53 negative

Customers find the Fitbit Flex 2 easy to manage and put on, with one customer specifically mentioning it's simple to set daily step goals.

"...of the pool (either flip turn or simply turning around) are very easy to distinguish, so the device accurately tracks your number of laps...." Read more

"Simple and accurate for steps and sleep. Minimalist wrist that works" Read more

"...Tracker syncing to the iPhone app is seamless. Setting it up was easy. 4) Tracks steps in real-time...." Read more

"...The tracker is very easy to put into the band. I'm slightly OCD so it takes me a few to get it the way I like it...." Read more

546 customers mention "Sleep tracker"337 positive209 negative

Customers have mixed experiences with the sleep tracker: while some find it very accurate at auto-tracking activity, others report that it stops tracking sleep.

"...are very easy to distinguish, so the device accurately tracks your number of laps...." Read more

"...did get it to work, but when I woke up the next morning, my sleep had not been tracked and my step count from the previous days was still showing up..." Read more

"...The features I find the most useful, to be honest, are the sleep tracker, the alarm, and vibrating when I'm getting a call...." Read more

"...There are lots of features such as weight and food tracking (that I don't use) and these are probably useful for some...." Read more

306 customers mention "Value for money"211 positive95 negative

Customers have mixed opinions about the value for money of the fitness tracker, with some finding it a great deal and worth the money, while others consider it not worth the $50 price tag.

"...chose the Flex 2 for its slim profile, waterproof design, and lower price point...." Read more

"...This is my first time purchasing a Fitbit product and it was well worth the money...." Read more

"...This thing is also exorbitantly over priced...." Read more

"...The waterproof aspect is huge, and a great plus. It's also cheap in comparison to the other Fitbit models...." Read more

276 customers mention "Durability"99 positive177 negative

Customers have mixed experiences with the biometric monitor's durability, with some finding it very reliable and secure, while others report that it is not a reliable device and does not last very long.

"...product that is shat out of Silicon Valley this is much more about hype that quality, ease of use, stability of tech and quality of service...." Read more

"...Update process was smooth 4. Better appearance and stronger clasp. Cons:..." Read more

"...I just wish it was more durable and that the bands were designed better to hold the unit in more securely. Fitbit has replaced this my unit twice...." Read more

"...All in all I’m extremely annoyed that the thing dies so quickly, I would not purchase this again, however it does the job!" Read more

383 customers mention "Battery life"103 positive280 negative

Customers report significant issues with the Fitbit Flex 2's battery life, noting that it drains quickly and only lasts about 5 days between charges.

"...1. Seems to last about 5 days between charges, old one was 7. That may change as I stabilize my usage pattern. 2...." Read more

"...my old Fitbits (all 8 of them) are dead from sweat/oil intrusion, battery failure, and connectivity failure...." Read more

"...The app is superb, the Fitbit is tiny, water resistant, and holds a good charge. The band is nice too...." Read more

"...I am finding that I need to charge the tracker every 4-5 days...." Read more

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Niki Z
Tiny, rugged, basic, and excellent!
Reviewed in the United States on October 2, 2017
Color: BlackVerified Purchase

This summer my fiance requested a Fitbit. One night there was a sale too good to pass up, so I quickly did as much research as I could and weighed it with what my fiance wanted in a fitness band. I got her the Alta back in late June and she loved it! After having it for a week or two and really getting acquainted with it, she started showing me all the stuff it tracked in the app and I was seriously impressed. As a longtime Samsung Gear Fit user, I saw the Fitbit app blew the Gear Fit's out of the water. When I originally got my Gear Fit I wanted something that tracked my heart rate and steps but also could show me time, texts, and notifications from certain apps, as I missed wearing an actual watch, but wanted some tech too. While I still wanted a watch, I decided to get myself the smallest, cheapest Fitbit so I too could utilize the app, and I am thrilled with this little guy. So these days I still wear my Gear Fit on my watch arm and the Flex 2 on my other wrist. It works for me and I am very happy. The thing I love about the Flex 2 is its size. It is so small! My one main problem with the Gear Fit was that it was just a bit too big to sleep with on, as it would cause my arm to really fall asleep badly, so I could never utilize the sleep function of the watch. Even the Alta my fiance has is too big for her (causes the same problem on her as my Samsung does with me) but this Flex 2 poses no such problem with me, so I have been really happy that I can now track my sleep. It has given me some serious insight into how I spend my sleeping hours.

Overall, I lover this thing! The app is superb, the Fitbit is tiny, water resistant, and holds a good charge. The band is nice too. The next smartwatch I get will be more aesthetically pleasing and less fitness based because I've got this little Flex 2 that tracks all the fitness type stuff I need.

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S. Marcus
Highly recommend for you swimmers!!! Of course for runners too!
Reviewed in the United States on October 15, 2016
Color: BlackVerified Purchase
Ok, I am a longtime Fitbit user and was hoping the Fitbit2 would be a quantum improvement on an otherwise great product. After using it for a few weeks I can say that it certainly is.
The core functions of the original Fitbit always served my running workout routine well. However I always wished I could use it in the pool. That said I was skeptical it would actually record my lap swim accurately. It worked great, better than hoped for. My first clue that this was a quantum improvement came after the first gym visit wearing the Fitbit2. It recognized that I was on a elliptical machine and recorded it promptly. For the swim, I set the pool length (finding how to do that was not easy though) and started in. I also set it to notify me when I passed my 45 minute first benchmark. I also used a watch and counter also to make things honest. At 45 minutes the band vibrated which I could feel in the water. After I found it had not only correctly timed the 1 hour swim, but had correctly calculated the distance and added to the Dashboard!! Wow, just what I needed!!
I noticed a few concerns, but nothing that have kept me from being impressed. All and all, so far HIGHLY recommend.
Pros:
1. Does all the original Fitbit did in a smaller more secure package
2. GREAT for swimming laps. No need to wear a separate swimming watch.
3. Update process was smooth
4. Better appearance and stronger clasp.

Cons:
1. Seems to last about 5 days between charges, old one was 7. That may change as I stabilize my usage pattern.
2. Not simple to program swim mode. Seems simple after you figure it out but not immediately intuitive.
3. The way the device inserts into the band requires bending the band. This concerns me that band breakage such as with the Fitbit1 may become a problem again.

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M. Juniper
are you willing to chance it? this piece of trash doesn't work for a lot of people!
Reviewed in the United States on January 13, 2019
Color: BlackVerified Purchase
I am among the sizable minority of people for whom this Fitbit Flex 2 simply did not work. I had repeated problems trying to get it to sync to the app, and after literally hours of effort, was finally able to get it to work FOR ONE DAY. The next day it would not sync, and even following the same methods (and more!) that I had tried the day before did not fix the problem. The device itself did seem to be functioning properly (in that it delivered the appropriate feedback to indicate when I had achieved the first 2500 steps, the next 2500 steps, etc.). The problem is the ability of the device and the app to sync with each other.

Here's what I tried to get this Fitbit Flex 2 to work:

Uninstall and reinstall the app (close to a dozen times probably)
Turn off Bluetooth and turn it back on (at least a half dozen times, probably more)
Reboot the pebble using the charging cable (twice)
Force stop the app (at least twice)
Run through the steps in the app to sync it with the device (at least 2 dozen times)

In running through the steps in the app to get this device to sync to the app, sometimes I got to the point where it said "We found your tracker!" and sometimes I didn't. I was only ever able to get it to pair twice. The first time it paired (apparently?) but wasn't showing any data in the app, and the second time I did get it to work, but when I woke up the next morning, my sleep had not been tracked and my step count from the previous days was still showing up for the current day, with a "sync error" type message. I was never able to get it to sync to the current day after that.

My entire experience with this product has been extremely frustrating. I definitely want a fitness tracker, but my experience with this product has turned me off of Fitbit entirely.

I am extremely disappointed, as I really liked the minimalist design of this tracker. I am returning it (of course). I wish I could also be compensated for the hours of my life I invested in trying to get this thing to work, and the amount of frustration I experienced in the process. I can't believe Fitbit has such a good reputation.

DO NOT BUY!!! This item is a piece of trash.

UPDATE: I purchased a no-name fitness tracker for one third the price of this one, and I am very happy with it. Setting it up and synching it to the app were both a breeze. Don't waste your time with this one. You can pay less and be a happier customer too.

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Parth
Great product with very few flaws
Reviewed in India on December 6, 2016
Color: BlackVerified Purchase

Reviewing after around 10 days of use

Pros:
Excellent tracking - Fitbit's algorithms are very accurate at tracking the distances and exercises even without having a GPS sensor built in
Excellent app - love the infographics shown. it is one thing being able to track steps and another representing it beautifully in all the myriad ways that they do
Very lightweight - get used to wearing it in just a few hours
Swim-proof - have yet to go for a swim but was one of the major reasons for me buying it

Cons:
Battery - this is the biggest let down. for a device which doesn't have GPS or a screen, the 4-5 day battery life is a major let-down. The compact, lightweight form factor only partially makes up for this
No clock - call me a tradionalist, but if I'm wearing something on my wrist, it should bloody well show the time
No heart-rate monitor, GPS - while Fitbit's algorithms do a great job of calculating calories and distances, it is always good to have dedicated monitors for these. but then, this is the cheapest of the Fitbits

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João Luiz Fontana de Figueiredo
Excelente, porém...
Reviewed in Brazil on January 9, 2019
Color: BlackVerified Purchase
Produto excelente, bonito, leve e ótimo para o dia a dia... O único defeito é que não notifica mensagens de texto do WhatsApp!

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David V
Buen monitor
Reviewed in Mexico on October 31, 2017
Color: BlackVerified Purchase
Me agrado bastante esta banda. Dudaba en adquirirla debido a que no tiene pantalla. Pero a favor tiene que es demasiado delgada y discreta y es a prueba de agua. La pantalla no la extranie ya que toda la informacion esta disponible en el celular mediante bluetooth.

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Abbas alaqeel
التتبع
Reviewed in Saudi Arabia on September 7, 2023
Color: BlackVerified Purchase
سوار حلو ويجي مقاسين داخل الكرتون ويقرا الخطوات والتمارين عن طريق التطبيق وتنبيه بالمكالمات والرسائل عن طريق الاهتزاز
شكرا على المنتج

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chainmailgoddess
I for one welcome our new robotic overlords!
Reviewed in Canada on July 28, 2018
Color: BlackVerified Purchase
This little gizmo that will tell you to move when you're being lazy, and celebrates when you hit your step goal! It's simple, it doesn't have a watch because time is a silly wibbly wobbly ball of...stuff anyway, I like it. This is a lot of fun and has helped keep me from dying early from a sedentary lifestyle as a human battery powering the Matrix.

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Brand	Fitbit
Material	Elastomer, Stainless Steel
Color	Black
Compatible Devices	Smartphones, Tablets, Desktops
Team Name	Fitbit
Product Dimensions	0.64"L x 0.35"W x 0.45"H
Item Weight	0.04 Pounds
Sensor Type	Accelerometer
Battery Description	Lithium-Ion
UPC	810351028888

Fitbit Flex 2, Black (US Version), 1 Count

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5.0 out of 5 stars Tiny, rugged, basic, and excellent!

5.0 out of 5 stars Highly recommend for you swimmers!!! Of course for runners too!

1.0 out of 5 stars are you willing to chance it? this piece of trash doesn't work for a lot of people!

Top reviews from other countries

5.0 out of 5 stars Great product with very few flaws

4.0 out of 5 stars Excelente, porém...

5.0 out of 5 stars Buen monitor

5.0 out of 5 stars التتبع

5.0 out of 5 stars I for one welcome our new robotic overlords!

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Product Summary: Fitbit Flex 2, Black (US Version), 1 Count

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Tiny, rugged, basic, and excellent!

Highly recommend for you swimmers!!! Of course for runners too!

are you willing to chance it? this piece of trash doesn't work for a lot of people!

Great product with very few flaws

Excelente, porém...

Buen monitor

التتبع

I for one welcome our new robotic overlords!

Product summary presents key product information

Keyboard shortcut shift + alt + opt + D