Fitbit Flex Wireless Activity and Sleep Tracking Wristband, Slate

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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 and Waitrose shops for collection tomorrow from 2pm
261 participating John Lewis and Waitrose shops

Standard UK delivery within 5 working days


Next, named or Saturday UK delivery.


Next/named day UK delivery pre-10.30am.


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

Trial in Scotland, Wales, SW England and N Ireland only

1500 participating Collect+ shops

International delivery not available


We want you to be happy with your purchase. If you're not, just return the products to us or to one of our shops. Unless faulty, we'd like this to be within 90 days of purchase. Exceptions apply to certain products - find out more about our refund policy.

Depending on the type of product, you can make free returns via our shops, Royal Mail (or courier collection for large or heavy items), Collect+ or via MyHermes.

Find out more about returning products

Q & As


Fitbit Flex Wireless Activity and Sleep Tracking Wristband 3.8 5 16 16
Very addictive Does exactly what it claims. Easy to use and a great support in getting fitter. 29 March 2014
worth having purchased my fitbit in February pros : love that it motivates me to be accountable for my daily exercise. con's : have had to replace my wrist band after 2 weeks as it split, now having problems with the charger 29 March 2014
Not good enough Not very accurate and a little bit hard to use it. 25 March 2014
2nd time lucky Bought one of these and battery didn't charge. Exchanged and replacement works fine. Great activity tracker, and motivator. Especially good to have one each and compete to beat each other on steps! The dogs have been having extra long walks! 28 February 2014
Fairly good The pros... Light, superb on-line interface accessible via smartphone and cheaper than other activity bands. The cons... Plasticky, it doesn't like water! Splash proof.... it isn't (having had a nike fuelband, nothing new here!) And finally tends to reset itself very easily, which is simple and easy to sort out, provided you've noticed! 27 February 2014
Addictive! Great little bit of kit that inspires you to do more!! Looks cool, waterproof so not needed to take off at all. At first, the emails were excessive telling you how many steps you'd done etc, but you can tailor the emails so don't be put off by that. Great talking point, everyone who has seen it, wants one!! 11 February 2014
Excellent motivator I have been using my Fitbit for five months now and it has changed me from someone who could never find the time to walk to one who misses it on days when I really am too busy; it is worth it for that alone. I found it easy to set up and use and have had no problems with it at all except a failure to charge on one occasion which was due to the contacts needing a clean. It doesn't log altitude/effort so you underscore when climbing hills but it never said it would - I think a more expensive version does this. At least three of my friends have bought a Fitbit and all are very satisfied with the product. 10 February 2014
Useful activity tracker The Fitbit Flex is easy to use, I have been using mine for 5-6 weeks now - I use it to track everyday activity and fitness goals as well as calorie/food/water intake and sleep. Only things I would suggest need upgrading are: manual activity logs don't seem to register in the day's total goal record and the bar charts are not very touch sensitive when trying to interpret what means what. Otherwise - this is a good piece of kit and I would recommend 03 February 2014
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