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Fitbit Flex Wireless Activity Tracker and Sleep Wristband

by Fitbit
2,853 customer reviews
| 34 answered questions

RRP: £79.99
Price: £44.99 & FREE Delivery in the UK. Details
You Save: £35.00 (44%)
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Dispatched from and sold by Amazon. Gift-wrap available.
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19 new from £40.50
  • 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
  • Records steps taken, distance travelled, calories burned

There is a newer model of this item:

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£44.99 & FREE Delivery in the UK. Details In stock. Dispatched from and sold by Amazon. Gift-wrap available.

Frequently Bought Together

  • Fitbit Flex Wireless Activity Tracker and Sleep Wristband
  • +
  • The Friendly Swede Silicone Fasteners for Fitbit Flex Wristband (12 Pack)
Total price: £49.98
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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 3 Oct. 2013
  • Average Customer Review: 4.0 out of 5 stars  See all reviews (2,853 customer reviews)
  • Amazon Bestsellers Rank: 10 in Sports & Outdoors (See Top 100 in Sports & Outdoors)

Product Description

Product Description

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.

Wear and Care
Our products are meant to be worn all day and night, so it’s important to follow a few simple guidelines as you wear and care for your device. To keep your band clean and your skin happy follow the following steps:

  • Keep it clean: Regularly clean your band and wrist - especially after working out, sweating, or exposing your skin to substances like soaps and lotions, which can get trapped beneath the band
  • Keep it dry: If your band gets wet - like after sweating or showering - rinse and dry it thoroughly before putting it back on your wrist
  • 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
  • Make sure your band isn’t too tight: Wear the band loosely enough that it can move back and forth on your wrist

Box Contains

  • 1 x Fitbit flex tracker
  • 1 x Small wristband
  • 1 x Large wristband
  • 1 x Charging cable
  • 1 x Wireless USB dongle
  • 1 x Free fitbit account

Note - The charging cable and wireless USB dongle are stored in the bottom section of the box.

From the Manufacturer

Category Everyday Everyday Everyday Everyday Active Performance
Steps, Calories, Distance
Sleep Quality and Silent Alarm
Floors Climbed
Active Minutes
Caller ID
Continuous Heart Rate
Music Control & Notifications
GPS Tracking

Customer Reviews

Most Helpful Customer Reviews

1,775 of 1,838 people found the following review helpful By PT Cruiser TOP 100 REVIEWER 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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50 of 53 people found the following review helpful By Bryony Richardson on 20 Jun. 2015
Colour Name: Slate
Tried for years to lose weight and never stuck with diets or fitness programmes as I get bored. This little gadget has been amazing for me in providing the incentive to keep going. So far I have lost 11lbs in 8 weeks! The Flex tracks your activity throughout the day and calculates the calories burned and active minutes, and by downloading the Fitbit app you can log in and note the foods you have eaten. The simple burn more calories than you consume. Certain activities like cycling or using a rowing machine don't register on the tracker but you can enter a record manually on your phone, tablet or laptop. At the end of the day you can check your goals such as daily steps, distance and calories burned and get great satisfaction at seeing all those lights turn green......if not then it's back out for another walk with the dog! The Flex also tracks your sleep pattern, has a vibrating alarm function that really works (I am a heavy sleeper and it wakes me up) and notifies you during the day when you reach your goals. My daughter has since bought the Fitbit Charge which includes a watch display, numeric step counter rather than just lights and keeps track of floors climbed. If you can afford the extra go for the Charge although the Flex is an affordable and reliable little gadget that I am more than happy with.
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562 of 610 people found the following review helpful By Dan_M on 18 Aug. 2013
Colour Name: Slate
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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1,002 of 1,095 people found the following review helpful By Ebuyer TOP 1000 REVIEWER on 18 Jun. 2013
Colour Name: Black Verified Purchase
I waited a long time for this to be released onto the market and now I've used it for a few weeks I'm not quite sure about it. There's an expectation (probably fuelled by the hype around these devices) that they're something more sophisticated than a pedometer that sits on your wrist - well, even with all the complex algorithms and blurb, they're still measuring movement at wrist level. That said, if you understand this and make the necessary allowances you should be able to get a decent benchmark on your daily activities but a £10 manual pedometer will do the same for you.

Here are my pro's and con's:


Sits nicely on your wrist and is comfortable and unobtrusive.
Quick indication of your planned "steps" for the day.
Great app with continual bluetooth connection - this is the best out there.
Doesn't need to be removed for bathing.
Tracks sleep pretty effectively.
You can integrate other data (BP, food, water weight etc.) on the web site. This is a novelty when you first start out but who seriously has the time to do all this?

Water gets in the bracelet and it gets gunky in the strap.
Unpredictable tracking of movements - it tracks cycling but for no logical reason and not accurate so it throws the figures way out. Same for cross trainer. Same for typing.
Battery life is short - 4 days max for me so far.
If the battery goes flat you lose all the unsynchronised data - easy to do if you're not near a charging point and I don't think there's any indication on the device that it's going to fail - you have to refer to the app.

So, I'm unsure about it. It's as good if not better than any of the others out there but it's really not much different to the old fashioned pedometers.
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Colour: Black