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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

List Price: $99.95
Price: $97.03 & FREE Shipping. Details
You Save: $2.92 (3%)
In Stock.
Ships from and sold by Amazon.com.
Two wristbands included, Large and Small
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
62 new from $92.79

Seventh Gen
Check Out the New Fitbit Flex Accessory Bands Comes in 3 vibrant colors: violet, pink, and teal. Learn more
$97.03 & FREE Shipping. Details In Stock. Ships from and sold by Amazon.com.

Frequently Bought Together

Fitbit Flex Wireless Activity + Sleep Wristband, Black + Set 10 Colors Large L Replacement Bands for Fitbit FLEX Only With Clasps /No tracker/ 1pc Orange 1pc Violet 1pc Red (Tangerine) 1pc Teal (Blue/Green) 1pc Navy 1pc Green (Lime) 1pc Black 1pc Slate (Blue Grey) 1pc Purple/Pink 1pc Light Blue Bands Wireless Activity Bracelet Sport Wristband Fit Bit Flex Bracelet Sport Arm Band Clasp Armband
Price for both: $105.66

These items are shipped from and sold by different sellers.

Buy the selected items together

Special Offers and Product Promotions

Size: Two wristbands included, Large and Small | Color: Black
  • Unlimited Cloud Storage: Never run out of space for all your photos, videos, and files with unlimited storage plans from Amazon Cloud Drive. Try either plan for 3-months free. Learn more


Important Information

Legal Disclaimer
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 Description

Size: Two wristbands included, Large and Small | Color: Black

Never stop moving with Fitbit Flex. Wear this slim, stylish device all the time and get the motivation you need to get out and be more active. It tracks steps, distance, and calories burned and shows you how you're stacking up against your daily goals. At night, it tracks your sleep cycle, helps you learn how to sleep better, and wakes you silently in the morning. Access your stats anytime on your computer, tablet or from leading smartphones – both iPhone and Android. Flex is your perfect companion, it's with you everywhere...even in the shower. Plus, it looks good no matter what you're wearing.


FREQUENTLY ASKED QUESTIONS

What mobile devices are supported for syncing?

The Fitbit Flex can sync directly to select iOS and Android devices. IOS: iPhone 4S, iPhone 5, 5S, 5C, iPod Touch (5th gen.), iPad 3, iPad 4, iPad mini. Android: Samsung Galaxy Note 10.1, Samsung Galaxy Note II, Samsung Galaxy S III, Samsung Galaxy S4

How do I charge my flex?

Your tracker battery lasts for about 5 days. To charge it, remove the tracker from the band and place it in the charger until all 5 lights are solid.

If you are having trouble, your tracker's charging contacts may be obstructed by microscopic dirt or debris that prevents them from making a good connection to the charger. Use hand sanitizer and a tissue or dampen a cotton swab with rubbing alcohol and carefully clean the charging contacts on your tracker. Do not submerge your tracker in water or use abrasive cleaners. Thoroughly dry your tracker before attempting to charge. Be sure to fully seat your tracker into the charger, with the charging contacts fully inserted into the charging cable enclosure.

How do I reset my tracker?

lf your tracker is not responding, it may be fixed by restarting.

1. Plug your charging cable into the USB port and insert your tracker into the charging cable.
2. Insert a paperclip into the small pinhole on the back of the charger.
3. Press on the pinhole for 3-4 seconds.

Your Flex will now be reset. Take your tracker out of the charger and insert it back into the wristband.

Can the wristband irritate my skin?
The Flex wristband is made of a flexible, durable elastomer material similar to that used in many sports watches. It does not contain latex. The clasp is made of surgical-grade stainless steel and contains traces of nickel. As with any type of jewelry, some people may experience allergies. Numerous factors can cause an allergy, such as a nickel sensitivity, reactions to bacteria that can accumulate in watch wristbands or other wearable devices, a reaction between the wristband and your soap or perspiration, or an allergy to the material of the wristband. If you notice any signs of skin irritation or experience any discomfort, please discontinue use.

From the Manufacturer

Online & mobile tools

Syncs stats wirelessly and automatically to your computer and 150+ leading smartphones – including Android, iOS and Windows.

Set goals, log food, see progress, analyze trends and earn achievement badges through your mobile and online dashboard.

Share and compete with friends and family on the leaderboard and in NEW Fitbit challenges.

Fitbit Flex

Wireless Activity + Sleep Wristband

This slim, stylish device is with you all the time. During the day, it tracks steps, distance, and calories burned. At night, it tracks your sleep quality and wakes you silently in the morning. Just check out the lights to see how you stack up against your personal goal. It’s the motivation you need to get out and be more active.

  • Activity tracking
  • Sleep monitor + silent alarm
  • Progress display
  • Style + accessories
  • Wear + battery Life
  • Personal dashboard

Activity tracking

Track steps taken, distance traveled, calories burned and active minutes.

Sleep monitor + silent alarm

Monitor how long and how well you sleep and wake with a silent alarm.

Progress display

See LEDs light up as you progress toward your daily goal.

Style + accessories

Style the slim, removable tracker your way with colorful accessory bands.

Wear + battery life

The Flex is water water-resistant and has a 5-day battery life.

Personal dashboard

The Fitbit app is full of graphs, charts, and tools designed to help you track your progress and better understand your health and fitness.

Category Everyday Everyday Everyday Everyday Active Performance
Steps, calories, distance
Clock
Sleep quality & silent alarm
Floors climbed
Active minutes
Caller ID
Continuous heart rate
Music control & notifications
GPS tracking

Product Details

Size: Two wristbands included, large and small | 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 ; 4 ounces
  • 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 (12,472 customer reviews)
  • Amazon Best Sellers Rank: #25 in Health & Personal Care (See Top 100 in Health & Personal Care)
  • Product Warranty: For warranty information about this product, please click here. [PDF]

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Customer Questions & Answers

Customer Reviews

I purchased this fitbit 2 1/2 months ago and now it has stopped working.
Anonymous
Save your money and buy something else or wait till Fitbit gets their kinks worked out.
Em
It is a great motivational tool to help you keep on track with your fitness goals.
Spencer

Most Helpful Customer Reviews

2,190 of 2,267 people found the following review helpful By PT Cruiser TOP 50 REVIEWERVINE VOICE on January 11, 2014
Color Name: BlackSize Name: Two wristbands included, large and small 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.
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6,088 of 6,387 people found the following review helpful By D. Graves on April 16, 2013
Color Name: BlackSize Name: Two wristbands included, large and small
The Flex is fairly 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. There are good reasons why there are so many negative reviews of the Flex. I strongly suggest that 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).
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3,556 of 3,734 people found the following review helpful By RST_ HALL OF FAMETOP 50 REVIEWER on May 17, 2013
Color Name: BlackSize Name: Two wristbands included, large and small 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.
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Fitbit Flex Wireless Activity + Sleep Wristband, Black
This item: Fitbit Flex Wireless Activity + Sleep Wristband, Black
Price: $99.95 $97.03
Ships from and sold by Amazon.com

Disclaimer: While we work to ensure that product information is correct, on occasion manufacturers may alter their ingredient lists. Actual product packaging and materials may contain more and/or different information than that shown on our Web site. We recommend that you do not solely rely on the information presented and that you always read labels, warnings, and directions before using or consuming a product. For additional information about a product, please contact the manufacturer. Content on this site is for reference purposes and is not intended to substitute for advice given by a physician, pharmacist, or other licensed health-care professional. You should not use this information as self-diagnosis or for treating a health problem or disease. Contact your health-care provider immediately if you suspect that you have a medical problem. Information and statements regarding dietary supplements have not been evaluated by the Food and Drug Administration and are not intended to diagnose, treat, cure, or prevent any disease or health condition. Amazon.com assumes no liability for inaccuracies or misstatements about products.