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

Click & collect from John Lewis or Waitrose shops tomorrow from 2pm
375 participating John Lewis and Waitrose shops

Collect + from a local shop from tomorrow - postcode exclusions apply for Collect+ deliveries

5000+ participating Collect+ shops

Standard delivery in 5 working days


Named or Saturday UK delivery


Named day UK delivery pre-10.30am


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.

Q & As

Rated 3.5 out of 5 by 72 reviewers.
Rated 4 out of 5 by Good product Easy to wear, accurate tracking with good App for mobile devices. It is slightly bulky, which isn't good under tight sleeve tops. Can sometimes be uncomfortable at night if you happen to lean on that arm. Overall worth the money. 17 November 2015
Rated 4 out of 5 by Promotes activity Easy to set up and to set own goals. Like the friends link as it pushes me to raise my effort so as to match my friends. It encourages me to get moving, which is what I wanted. Find sleep log is often a bit off, but maybe that is down to me. I use the app,via an iPad . I am annoyed by how often it wants my email and password to access my own data.. It may be different if linked to smart phone. The prong catch on the wristband is fiddly and if knocked can come undone. 17 November 2015
Rated 5 out of 5 by Love! Love! Love it! Ordered online - delivered as promised to store' - easy to set up and synch to phone - easy to use too! 11 November 2015
Rated 4 out of 5 by Love it! I started knowing very little about this product but managed to sync it to my mobile by following the simple instructions and haven't looked back! I am a horse rider and contacted fitbit support for advice on how to monitor my rides. I was very impressed by their service. Fascinated by the data from everyday activities like washing the car! I gave it just 4 stars because the bracelet is a pain and it doesn't often respond to the "sleep" instruction (which I deal with every morning using an alternative method). 13 October 2015
Rated 5 out of 5 by Love it! Really pleased with my purchase. It motivates me to be more active and count those steps. The step count seems to be quite accurate and the sleep monitoring is good too. I haven't used the food diary function yet but know others who rate it as well. All in all a great product that I would recommend to others 13 October 2015
Rated 5 out of 5 by Great for getting active Have now bought 3 so that all the family can keep fit, love the challenges with family and friends taking part, it can become very competitive and does encourage me to take my minimum 10,000 steps. Easy to set up and use and with the selection of extra straps available I can change the band to suit 02 October 2015
Rated 4 out of 5 by A good motivator! Comfortable to wear and appears to record steps, kms and sleep accurately, however less accurate about tracking actual exercise especially cycling. Will upgrade when can afford it! 30 September 2015
Rated 3 out of 5 by Decent devices, terrible software This is a general review on fitbit. I have two devices, The One, and the Flex. They're decent devices and will record your activity fairly accurately, I think. Even the One records my activity when I cycle, which I greatly appreciate. The Flex records it as well, although if the ride is a bit too smooth, it misses out a lot of movements. What I really don't like, however, is the fitbit software which is of bad quality compared to the devices. I use it on a PC and on a Windows phone. On the PC, I sometimes change my targets and it takes the software several attempts to update them. On my phone, it does not work properly with the Flex: it syncs and then immediately unsyncs. Same with the PC/Flex combo. I had to revert to the One which is now the only device that I use. If my best friends were not using fitbit, I would be using a different system. 28 September 2015
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£44.95 - £79.95

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Additional services

  • 2 year guarantee included