Fitbit Flex Wireless Activity and Sleep Tracking Wristband, Black

Product information

Fitbit Flex is the ideal way to track your activity without imposing on your lifestyle. Just strap it to your wrist and leave it there, through day and night and then sync it with your smartphone or computer to see how active you are.

Flex tracks a number of activites to help you evaluate your lifestyle:

  • Steps taken
  • Distance travelled
  • Calories burned
  • Active minutes
  • Hours slept
  • Quality of sleep

Flex measures your sleep and will tell you how long you slept and how many times you woke up, giving you a sleep quality score. Flex can also wake you up in the morning with a silent alarm that won't bother your partner.

You can use the app so set personal goals and then track them as you go by looking at the LED lights on the wristband. You can also sync your stats in real time to see a more in depth breakdown on select iPhones, Android devices and computers.

As well as tracking your activity and allowing you to set goals, the app will also allow you to log food, workouts and more. Fitbit will arrange the data in easy to follow graphs and charts so you can track your progress and set achievable goals. You can earn badges and connect with friends to share and compete and motivate yourself further.

Flex is also water resistant, so it can go out in the rain without risking damage.

The Fitbit app is currently confirmed to work with the following devices:
iPhone: 4S, 5
iPod Touch: 5th generation
iPad: 3rd generation, Retina Display, mini
Samsung Galaxy: S4, SIII, Note II, Note 10.1

What's included:
Small & Large Wristbands
Charging Cable
Wireless USB dongle
Free Fitbit Account



Click & collect

Free Click & collect from John Lewis or Waitrose shops for collection tomorrow from 2pm
370 participating John Lewis and Waitrose shops

Standard delivery in 5 working days (after Christmas)


Next, named or Saturday UK delivery (in time for Christmas)


Next/named day UK delivery pre-10.30am (in time for Christmas)


International delivery not available


We want you to be happy with your purchase. If you're not, depending on the type of product, you can make free returns in the UK via John Lewis shops, Royal Mail, Collect+, or MyHermes. If you need to arrange collection of large or heavy items, call us on 03456 049 049. For international returns queries, call us on +44 1698 545 454. Find out more about returns.

You'll find returns information on your delivery note. Unless faulty, we'd like you to make your return within 90 days of purchase. Exceptions apply to certain products - find out more about our refund policy.


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Q & As

Fitbit Flex Wireless Activity and Sleep Tracking Wristband 3.6 5 37 37
Easy to use! Easy to use, good displays and graphs on the app. Motivates you to do more steps. Can record food eaten but this is for US brands which is a shame! 16 December 2014
poor battery and JLP service Bought the fitbit flex back in August, and it has been a great little motivator. The battery was never fantastic, and lasted 2 days tops. Recently, I was emailed during my second day (lunchtime) without charging, that I had very little power left, and to charge the fitbit immediately. Since then, the battery barely lasts a day, so recording my sleep is now not possible, as I charge it overnight. Contacted JLP about a replacement, and was told to take into a store (not really convenient), to have it checked out, and see if it was repairable. This is not what I expected, nor experienced by the usually impeccable John Lewis Customer service. I was told it could take upto 2 weeks to either repair or replace. Overall, not very happy, and will go instore and ask for full refund. 01 November 2014
Fun with feel good factor My husband had one so I thought I had better join in! 30 September 2014
Excellent product - recommended I bought this as a treat in my summer-holidays and I have prospered from buying this Fitbit. It is a absolute must have if your wanting to lose weight or simply just to know your personal stats. I definitely recommend this and lots of people in our school have got them and they recommend them to. Good christmas present. I bought these for 2 of my boyfriends and they love them!!! (and we wore them to hollywood!) 16 September 2014
Fitbit Flex It's great... Easy to wear, easy to use and a very good motivator 20 August 2014
Brilliant! I love this tracker. It has so much going for it that I can't do anything else but recommend it. Fitbit have also nailed it with the accompanying smartphone app and website. The Flex itself is subtle, secure and swimproof. I also love the fact I can take the sensor (it's tiny!) out of the wristband and pop it in my pocket if I want - something I do at work. It accurately records steps (I've tested it against a number of different step trackers) and is a brilliant sleep tracker. If you forget to activate the sleep mode (or fall asleep beforehand), just go to the app or website and add the time period of your sleep; Fitbit calculates your sleep pattern anyway based on your movement. The battery life is good (I get around 5-6 days out of it) and the three-or-so-hours charging time doesn't really impact on recording your activity. I would probably prefer a longer time between charges, but I'm just being picky. The accompanying website is fabulous and allows you to connect to numerous other services to sync activity and calorie data. The smartphone app (I have the iOS version) is just brilliant. If you don't have a Flex, this app is a really good indicator of how the Flex works and how FitBit records your activity. If you have an iPhone 5S with the M7 chip, then it will also track your steps accurately. It's free to use (and it's free to have an account with Fitbit), so if you're thinking of buying a Flex then download the app. Some of the functions are missing, but it's a great advert for Fitbit and their trackers. the latest update even allows you to record runs and walks. The app links with the Flex by Bluetooth Low Energy. Saying that, you don't need to have the Bluetooth switched on all the time, just switch it on to sync your data. the Flex also comes with a USB dongle to wireless connect every 15 minutes if you are within range. So what don't I like about the Flex? Nothing. 19 August 2014
Disappointing in some respects... The good thing about this product is that it is motivational and the analysis that comes from Fitbit after I have 'synced' using the supplied dongle and my computer is interesting although the criteria for, e.g., the 'Very Active Minutes', is not clear. I think that it is inaccurate to say that this device is an 'activity monitor' - cycling seven miles on my static exercise bike scarcely registers so the flex is really just a step counter. The wristband is really bad as after a few weeks of use it is showing signs of splitting. I am going to order a replacement but not a Fitbit one, partly because of the high price and partly because of its unsatisfactory nature. #Amazon sell much cheaper alternatives which get decent reviews.# The Flex came with two wristbands but the second is not useable by an adult - I have very small wrists for a man. I also have a Digi-Walker pedometer #obtainable for a very reasonable price# which was supplied to me as part of a research project I am participating in which gives broadly similar results to the Fitbit but both devices for reasons I don't understand give anomalous results on odd days. #The Digi-Walker doesn't link to a computer to give analysis of the results.# 11 August 2014
Great integration with phone and apps I did a lot of research into fitness bands before settling for the Fitbit - mainly because it works with my phone (Galaxy S4) and can connect to some of the apps I use to monitor fitness and food (MapMyRun and My Fitness Pal). These things work together to bring me a large amount of data that I can then analyze to work out my performance during the day and over a whole week. However, for anyone that has a non-compatible phone or perhaps doesn't use these (or similar) apps, the data may be less interesting. I have found the Fitbit very easy to set up and use, very motivating in terms of helping me reach my goals and even the dashboard is very attractive to look at! Overall this has been a great buy and I would recommend it. 05 August 2014
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