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Fitbit Flex Wireless Activity Tracker & Sleep Wristband

by Fitbit
| 34 answered questions

Price: £79.99
Sale: £74.66 FREE UK delivery.
You Save: £5.33 (7%)
Usually dispatched within 3 to 4 days.
Dispatched from and sold by Millet Sports.
23 new from £67.00
  • Records steps taken, distance traveled, calories burned
  • Record active minutes, hours slept, quality of sleep
  • Silent wake alarm, water resistant
  • Track your goals with online and Mobile tools
  • Set your goals and sync your stats

Introducing the Fitbit Charge Activity Tracker
Introducing the New Fitbit Charge Activity Tracker
Energise your day with the new Fitbit Charge. Morning to night, Charge lets you monitor your trends by wirelessly syncing data to your smartphone and computer. So no matter where you are, you stay motivated to step up your fitness and beat your goals. Learn more.

Frequently Bought Together

Fitbit Flex Wireless Activity Tracker & Sleep Wristband - Black + Smaller Size Replacement Band For Fitbit Flex Wireless Wristband Bracelet with Clasp / No Tracker--Violet + Smaller Size Replacement Band For Fitbit Flex Wireless Wristband Bracelet with Clasp / No Tracker--Lake Blue
Price For All Three: £87.34

These items are dispatched from and sold by different sellers.

Buy the selected items together

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Colour: Black

Product details

  • Boxed-product Weight: 100 g
  • Delivery Destinations: Visit the Delivery Destinations Help page to see where this item can be delivered.
    Find out more about our Delivery Rates and Returns Policy
  • Item model number: FB401PK-EU
  • ASIN: B00CK82GBQ
  • Date first available at Amazon.co.uk: 3 Oct 2013
  • Average Customer Review: 4.0 out of 5 stars  See all reviews (1,485 customer reviews)
  • Amazon Bestsellers Rank: 1 in Sports & Outdoors (See Top 100 in Sports & Outdoors)
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Product Description

Product Description

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

Additional bands available in Teal, Tangerine, and Navy:

Set Your Goals view larger

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 never sleeps. Wear the comfortable wristband all 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.

Wear It All the Time

Flex never leaves your side. It fits comfortably around your wrist all day and night. You can even wear it in the shower.


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.


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

Track Your Goals view larger

Box Contains

1 x Fitbit Flex Tracker
1 x Small Wristband
1 x Large wristband
Charging Cable
Wireless USB dongle
1 x Free Fitbit Account

Customer Questions & Answers

Customer Reviews

Most Helpful Customer Reviews

815 of 837 people found the following review helpful By PT Cruiser on 9 May 2014
Colour Name: Black
Update 7/3/14 - Fitbit just came out with a new upgrade to the Fitbit app for the iPhone which adds some very cool GPS features. 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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13 of 13 people found the following review helpful By CER on 4 Dec 2014
Colour Name: Slate
Its a great concept, and the software app seems pretty good, however, the delivery of the product doesn't live up to expectations. I purchased one for my wife for her birthday in September, she has only removed it once each week for recharging, and the plastic strap that holds the transducer in place has already perished. I wrote to the supplier, but as yet I have received no response. Its a pretty tacky package for a unit that cost in excess of £70. I'd like to see some correspondence either from Amazon or the suppier, but as yet, nothing.
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7 of 7 people found the following review helpful By Peter Lee TOP 1000 REVIEWERVINE VOICE on 8 Dec 2014
Colour Name: Black Verified Purchase
I'm not a fitness enthusiast, but for a long time I've wondered just how far I walk each day, and how well I actually sleep. I bought one of these as an Amazon "Black Friday" offer and it quickly became my latest obsession.

The box contains the Fitbit flex - a rubbery wristband with a small "chip" inside it which can be removed if you'd prefer to carry it in your pocket for example - along with a smaller wristband, and a charging dongle of sorts into which the "chip" is inserted whilst the other end plugs into a USB socket on a computer or your mobile phone charger. You'll need a Bluetooth device of some sort - a phone, a computer, or a tablet - to configure it. I used the Android and iOS apps, both of which are very similar in terms of look, feel and functionality. The initial configuration is a matter of installing the app (or visiting the website if you're using a computer), firing up your Bluetooth, and the app will find your Fitbit. Create a Fitbit account, and that's pretty much it. Within a few minutes I had the band on my wrist and I was away.

Via the website you can set goals for number of steps walked each day and so on, and while you're on the move you can use the app to document what you've eaten, how much water you drink, and if you do any specific exercise activity such as swimming, cycling and so on. The rest of the time the Flex sits on your wrist and records what you get up to. You don't need to keep your Bluetooth switched on on your phone, and you don't even need your phone to be nearby, as the data gets stored inside the Flex until you choose to download it by opening the app and enabling Bluetooth on your phone.
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397 of 425 people found the following review helpful By Dan_M on 18 Aug 2013
Colour Name: Slate-Grey
I didn't buy my fitbit flex from amazon, but rather a high street catalogue shop and in fairness that was because I wanted it then and there as I was about to go running and wanted to try it out.

I already had a fitbit zip which was good but the amount of times I left it on the bedside cabinet meant days went without any tracking. so I thought the wristband would be better for me.

I use the large band and I'm happy that it's comfortable (if not the easiest to put on with one hand - but it won't come off) and I forget it's on my wrist.

I like the sleep tracking function - it has shown me what I already know - I'm a restless sleeper - but no advice on how to change that!

More so that anything else I set a target number of steps on my iphone and throughout the day give it a double tap and see my progress. I've yet to not achieve my goal as I find myself quite competitive and don't want to be beaten by a machine.

The up side of that is I'm spending more time with my dog out long walks and after 3 weeks of using it I've lost 6lbs in weight. my overall goal was to become more active and fit and as a result I knew I'd lose weight but I didn't think it would be that quick.

the iphone app is ok but the web dashboard is much better if you have the time to log in to it. the graphs are more detailed and easier to follow online. there is a fitbit premium service you can join for £39.99 but I did the one week trial and couldn't really see what all the fuss was about.

the flex is well made and easy to use and it's great if you can get your friends into a fitbit - you get a progress chart on your phone and it constantly updates showing who is in the lead for the week with the total number of steps - another great way to get motivated.
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