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  • Fitbit Flex Wireless Activity + Sleep Wristband, Black
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Fitbit Flex Wireless Activity + Sleep Wristband, Black

by Fitbit
| 1000+ answered questions
#1 Best Sellerin Health & Personal Care
List Price: $99.95
Price: $94.99 & FREE Shipping. Details
You Save: $4.96 (5%)
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Ships from and sold by Amazon.com. Gift-wrap available.
Want it tomorrow, Dec. 14? Order within and choose Same-Day Delivery at checkout. Details
Black
  • Tracks steps, distance, calories burned and active minutes
  • Monitor how long and well you sleep
  • Wakes you (and not your partner) with a silent wake alarm
  • LED lights show how your day is stacking up against your goal
  • Slim, comfortable and easy to wear (sold with both large and small wristbands included)
  • Includes small and large wristbands
This item ships internationally. Learn more
54 new from $89.35
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Frequently Bought Together

Fitbit Flex Wireless Activity + Sleep Wristband, Black + Fitbit Flex Wristband Accessory Pack, Small
Price for both: $116.98

Buy the selected items together

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Actual product packaging and materials may contain more and different information than what is shown on our website. We recommend that you do not rely solely on the information presented and that you always read labels, warnings, and directions before using or consuming a product. Please see our full disclaimer below.

Product Details

Color: Black
Product Warranty: For warranty information about this product, please click here. [PDF]
  • Product Dimensions: 0.6 x 0.4 x 8.2 inches
  • Shipping Weight: 4.8 ounces (View shipping rates and policies)
  • Shipping: This item is also available for shipping to select countries outside the U.S.
  • Origin: China
  • ASIN: B00BGO0Q9O
  • UPC: 898628002649
  • Item model number: FB401BK
  • Average Customer Review: 3.7 out of 5 stars  See all reviews (9,073 customer reviews)
  • Amazon Best Sellers Rank: #1 in Health & Personal Care (See Top 100 in Health & Personal Care)

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Customer Reviews

3.7 out of 5 stars
5 star
4,064
4 star
1,691
3 star
965
2 star
823
1 star
1,530
See all 9,073 customer reviews
I purchased this fitbit 2 1/2 months ago and now it has stopped working.
Anonymous
I really like it because it provides great motivation to keep moving and reach fitness goals.
Andrea Chesick
I like that it's water resistant and that I can wear it swimming or in the shower.
PT Cruiser

Most Helpful Customer Reviews

4,915 of 5,125 people found the following review helpful
Well, if the the Flex WINS the 'Fight' over the Up, you'd better read this...
By D. Graves TOP 1000 REVIEWER on April 16, 2013
Color Name: Black
The Flex is pretty good - IF you understand its limitations. And it has a lot of them. This is a 1.0 version, the first wrist-based tracker Fitbit has produced. Since the positive reviewer claims the Flex clearly wins its 'fight' over the Jawbone Up, I strongly suggest you wait for the technology to be refined by Fitbit (and others) before spending $100 or more on this.

I also suggest that you tune out the 5-star "this is AWESOME!" reviewers. I've had the Flex for 6 months now (acquired at CES 2013, long before retail availability) and initially I too was impressed by the technology. However, with long-term use, I think its inaccuracies make it nothing more than a pedometer with sleep analysis added in (and the usefulness of the latter is dubious as well). The IDEA of it all is excellent: to track your activities and see your progress over time via the great software that Fitbit has developed. However, all of this is predicated on the device accurately tracking your movements. If it fails in that aspect - and unfortunately it does, to a moderate degree - then all of the data and impressive charts and graphs are rather useless. The "awesome!" reviewers don't realize this (yet) and just assume what they're seeing is real; it isn't.

The underlying technological problem, as I see it, is in the placement of the tracker. Up until now, Fitbit trackers were to be placed on the torso. Now, it must be placed on the wrist (yes, the tracker itself can be taken out of the wristband and put into your pocket but all of Fitbit's calibrations and algorithms are designed for that wrist placement and you are making the problem worse by not having it on your wrist).Read more ›
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3,224 of 3,373 people found the following review helpful
Jawbone UP vs Fitbit Flex -- Fight!
By RST_ HALL OF FAMETOP 50 REVIEWER on May 17, 2013
Color Name: Black Verified Purchase
Several asked my opinion of the Flex after I had compared UP to ONE last fall. I'm more pleased with Flex than expected. This review will be specifically for those comparing the Jawbone UP to the Fitbit Flex. For those interested in my review of the One and Jawbone UP it is located here: UP by Jawbone - Large Wristband - Retail Packaging - Onyx:
---------------------

UPDATE: I uploaded several head-to-head app screenshots.

UPDATE: I've found that I am storing quite a bit of water in the Flex band pouch where the module goes. Even though they say it's shower safe, I'm pretty sure some funky stuff is going to be growing in there in a matter of time... But the band is replaceable!

---------------------

My journey with personal monitoring devices/pedometers started a LONG time ago: Before Fitbit even existed, with a device called the SportBrain. It was a traditional belt clip style so old that it plugged into a base that used a dial in phone modem to upload the usage data to a server. It was old. But my interest in devices that can help monitor and tell me about my activity started then, and we seem to be now in a golden age of personal data monitoring devices. Fitbit Flex, Jawbone UP, all of the Fitbit clip devices and so many more...

Hardware itself

The biggest drawbacks I found on the Jawbone UP were that it had no visual feedback about your daily achievement toward your goal and the fact that it had no visual battery indicator. It wasn't a problem for me personally, but for those who are hardcore driven on a daily basis to compare and achieve this could be a drawback for you.Read more ›
159 Comments Was this review helpful to you? Yes No Sending feedback...
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745 of 779 people found the following review helpful
I purchased three of these
By PT Cruiser TOP 50 REVIEWER on January 11, 2014
Color Name: Black Verified Purchase
Update 7/3/14 - Fitbit just came out with a new upgrade to the Fitbit app which adds some very cool GPS features and a bar code scanner in the Food Log. I'm adding details at the end of this review.

I bought 3 of these fitbit flex devices, one for myself, my husband and my sister. Before purchasing I researched several wristband devices such as the Jawbone UP, the Nike Fuel and and the Polar Loop. I also looked at the fitbit force which is a newer version of this band. The lack of water resistance on the force was a deal breaker for me. I wanted to be able to wear this band 24/7 and to be able to wear it in the shower or when swimming. That was part of what made it attractive to me. Also, after reading reviews about the clasp problems on the force and how many people lost them, I wanted no part of that. They are also quite a bit bigger and look clunckier. The wristband on the UP looked like it would catch on everything and had no display at all. The Polar had lots of quality problems. I wasn't crazy about the looks of the Nike. The display is nice and I can see how people would like them, but not my style. The fitbit flex, to my tastes, had the coolest look. I also know a couple of people who own the fitbit flex and they were very enthusiastic about them so that influenced me as well.

So here is what I like about the flex: I like the way it looks on my wrist. All of us got the slate color. You can also order bands in a few different colors, both here and on the Fitbit site. It is lightweight and even though I don't often wear a watch I don't notice this on my wrist at all. The clasp was VERY difficult to secure the first couple of times until the rubber softened up a bit and until I got the hang of it. I secured it off of my wrist a couple times when it was new.Read more ›
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Most Recent Customer Reviews

Five Stars

Great product and a great price

Published 1 hour ago by Gary Neddeau
Future health

I am recovering from Knee Replacement and Fitbit is so helpful to make sure I am doing my needed
amount of walking to strengthen my legs and knee to remain health for the... Read more

Published 2 hours ago by Joyce A. Addleston
Very disappointed. I ordered this for my husband for Father's ...

Very disappointed. I ordered this for my husband for Father's Day. Within a few weeks the first one was broken, so they sent a replacement. Read more

Published 3 hours ago by Amanda Casper
Five Stars

excellent. However, lost mine so I will eventually have to a new one

Published 3 hours ago by Megan
Would love to get a back up

I never leave or go anywhere with out this. Would love to get a back up... Thank you so much!

Published 3 hours ago by Connie Woodruff
One Star

I had it for about one week before it quit working

Published 4 hours ago by Amazon Customer
Christmas gift. Still wears it every day.

Christmas gift. Still wears it every day.

Published 4 hours ago by char
Three Stars

I used it for about a month and then the novelty wore off.

Published 5 hours ago by Michael Gaewsky
Five Stars

The fitbit is great. It is making me move more and I am telling everyone about it

Published 5 hours ago by Cheryl Maierle
Good Fitness Tracker, Minus One Frustrating Flaw

Overall I am quite pleased with my Fitbit. I love that it helps hold me accountable, and I can see daily results from my physical activity. Read more

Published 5 hours ago by GirlyMom

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