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

by Fitbit
| 29 answered questions

Price: CDN$ 119.95 & FREE Shipping. Details
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9 new from CDN$ 117.99
  • 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 (includes large and small wristbands)
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Frequently Bought Together

Fitbit Flex Wireless Activity + Sleep Wristband, Black + 2 Charging Cables for Fitbit Flex Only (not for Fitbit One or other Models) Band Wireless Activity Bracelet Sport Wristband Fit Bit Flex Bracelet Sport Arm Band Armband Charge Charger USB Wire + Fitbit Flex Wristband Accessory Pack, Small
Price For All Three: CDN$ 164.03

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Product Information

Color: Black
Technical Details
Item Weight9 g
Product Dimensions1.5 x 1 x 20.8 cm
Item model numberFB401BK-CAN
SizeTwo wristbands included, large and small
Number of Items1
Brand NameFitbit
Additional Information
Best Sellers Rank #13 in Health & Personal Care (See top 100)
Shipping Weight9 g
Date First AvailableMarch 19 2013
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Product Description

Color: Black


Fitbit Flex Wireless Activity + Sleep Wristband

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 smartphones – both iPhone and Android. Flex is your perfect companion, and stays with you everywhere - even in the shower.

At a Glance

Flexibility to Match Your Style


  • Tracks steps, distance, calories burned, and active minutes
  • Log food, weight, and more on Fitbit’s website or apps
  • Monitors how long and how well you sleep
  • Wakes you (not your partner) with a silent wake alarm
  • LED lights show how your day is stacking up against your goal
  • Set goals, view progress, and earn badges
  • Share and compete with friends throughout the day
  • Syncs automatically with select mobile devices and to your computer
  • Free iPhone and Android App
  • Instantly launch your Fitbit app by tapping your device with your NFC-enabled Android phone
  • Easy-to-wear, slim, comfortable wristband
  • Available in two stylish colors – black and slate
  • Accessory bands allow you to personalize your Flex
  • Wear all day and night - even in the shower
  • Rechargeable battery

What's in the Box

Flex Tracker, Large and Small Bands, Charging Cable, Wireless Sync Dongle, and Free Fitbit Account

Flex tracker is flexible. You can take this tiny tracker out and put into any of Flex's colorful bands to fit your mood.

Comes in:

  • Black
  • Slate

Accessory Bands (Sold Separately):

  • Navy
  • Tangerine
  • Teal

Flex wristband is sold with both small and large wristbands included. Click here to use the Flex Sizing Tool.

Set Your Goal. Sync Your Stats.

Goals and Tracking

Flex uses LED lights to show you how you’re stacking up against your daily goal. Each light represents 20% of your goal. You choose which one – steps, calories, or distance. It lights up like a scoreboard, giving you the motivation you need to get up and keep moving. Just check your stats right on your phone.

Wireless Sync

Flex syncs your info to select Bluetooth 4.0 devices, without plugging in or pushing buttons. It also syncs with select Android devices (Samsung Galaxy S III, Note II, and more), as well iOS devices (iPhone 5, 4S, iPad 3rd gen., iPad Mini, and more) and PCs and Macs. This gives you real-time access to your stats on the Fitbit dashboard throughout the day. Plus, with select NFC-enabled Android phones, simply tap your device to launch your Fitbit stats.


Flex comes with an arsenal of free online tools. Set goals on your personal dashboard and follow your progress through engaging graphs and charts. Use the Fitbit App for iPhone and Android to track steps, distance, calories, active minutes, and sleep, and receive goal progress notifications and milestone updates.


Flex syncs with popular fitness apps for an integrated fitness regiment. Apps include Sparkpeople, LoseIt!, MyFitnessPal, MapMyFitness, Runkeeper, and Endomondo.


Flex keeps you motivated and helps you reach and celebrate milestones by awarding badges as you reach daily and lifetime achievements and goals.


Enlist your friends and family in helping you reach your goals by sharing your stats, creating fitness challenges, and taking a group leader board challenge.


Log food consumption, weight, and weight changes, and additional workout info on the website and on the go using the Fitbit App for iPhone and Android.

Wear It All the Time

Flex never leaves your side - you can even wear it in the shower. Wear the comfortable wristband all day and night, and it will even track how long and how well you sleep. Online tools illustrate your deep sleep and wakeful patterns. Silent Wake technology wakes you with a gentle vibration at a desired time without an alarm or disturbing your partner.

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.

Customer Questions & Answers

Customer Reviews

4.0 out of 5 stars

Most helpful customer reviews

279 of 284 people found the following review helpful By PT Cruiser HALL OF FAMETOP 10 REVIEWER on April 23 2014
Color Name: Black
Update 7/3/14 - Fitbit just came out with a new upgrade to the Fitbit app for iPhones which adds a very cool GPS feature. I'm adding details down 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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131 of 137 people found the following review helpful By Alexander Inglis on June 23 2013
Color Name: Slate Verified Purchase
I am late 50s, office worker, pretty sedentary. I ordered the Fitbit because I hoped it would give me insight into how I burn calories, what I consume, and how I can be healthier managing both. But you can't do that without information ... and the wristband Fitbit silently tracks basic activities (walking, sleeping) that get logged to a Fitbit personal account. The input software for foods consumed is a bit fiddly but gets better after you create some custom foods (and since we tend to eat from the same basic of things, once entered they are easily plucked off the menu).

After two weeks, I can see exactly what I consume and how I can easily increase activity (without committing to gyms, etc): I am making a point of taking a brisk walk daily so that my daily calories burned are higher than consumed. I can track this easily on a PC, or Android tablet or smartphone. A big winner at such a small price!
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49 of 54 people found the following review helpful By Cybamuse on Jan. 21 2014
Color Name: Black
I came across this device and bought it without even reading a review. After reading loads of reviews, I did wonder if I'd made the right decision, but I think for what the device provides, it is almost the best out there (the Fitbit Force might be the closest to best for this type of device, but it's bigger so I am happy with the size of the Fitbit flex).

First and foremost, this device is not for those who want precise numbers - if you want to know precisely how many steps you walked, precisely how many calories you burned, will intuitively work no matter what type of exercise you are doing, then you will be disappointed. If, however, you are using this device in conjunction with something like myfitnesspal to keep track of calorie intake vs calorie burn, and have a better idea of how active you REALLY are, then this device is really good!

As far as the pedometer goes, it is on your wrist, not your hip, so it's recording your motion more by your arm swaying as you walk. Suddenly, you are conscious when you are walking and holding a bag in that hand because you fear the pedometer isn't picking up your steps...

*Motivates you - nothing like thinking, "Oh, I am only 2000 steps off doing 10,000 steps today to have met my goal of 10,000 steps" to actually do the steps! I found that my desk job meant at the end of the day I was not even getting in half of 10,000 steps per day, but with this device, I was reminded it might be better to get off at the station before my stop and walk home and get in those extra steps.
*The sync with myfitnesspal is a little buggy so has to be reset from time to time. But the synergy between the websites is good and really helpful.
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37 of 41 people found the following review helpful By Chicago Guy on Aug. 14 2014
Color Name: Black
The Fitbit device: Works great. Nice visual App on I-Phone. Motivates me to hit my goal every day. Easy-to-manage daily alarms. Not much use outside of miles/steps walked and the sleep monitor. A pedometer with a nice accompanying App.

The Fitbit wristbands: My original broke after two months of use. The plastic housing that holds the Fitbit device broke off from one side of the wrstband. I purchased a set of three replacement wristbands for $28. Sports Authority offered a $6 giftcard 'protection plan' for broken wristbands --- guess this happens frequently. The replacement bands have much smaller 'teeth' to connect the band together on your wrist. My first band lasted one day -- the housing broke off in the same fashion as my original. The wristband looks nice but the design is flawed. The replacements seem to be made of cheaper quality than the original in-pack wristband.

The Fitbit charger: After one month, I began to have frequent issues re-charging my Fitbit device. I would leave it plugged-in overnight only to see almost no battery life when I synched-up with the App. I realized my charging cord was damaged/flawed and now I must carefully balance the Fitbit on a surface level with the wall outlet in order to gain a full charge. I'll need to replace this cord in the near future.

Summary: The Fitbit device and App are terrific. All the peripherals required to wear and maintain the Fitbit device are of cheap quality and break.
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