FitBit Flex Wireless Activity & Sleep Tracker Wristband FB401YE with S & L Yellow

RRP: £94.99


Free P&P

Next Working Day Despatch, 48-72 Hours Tracked Delivery.

Manufacturer refurbished – Ex-display.

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SKU: FB401YE Category: Tag:

FitBit Flex Wireless Activity & Sleep Tracker Wristband with S & L Straps FB401YE Yellow

Set goals, track your performance and succeed!

The FitBit Flex monitors your day-tine and night-time routines to let you know how you can take steps to improve your fitness and wellbeing. The LED lights shows your progress at any time.

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 iPhone and Android smartphone or tablet.

Flex is your perfect companion, it’s with you everywhere…even in the shower.

Plus, it looks good no matter what you’re wearing.


During the day, it records your number of steps, your distance walked and your calories burned.

During the night, it tracks your sleep cycle – how long, how well and how intermittently you sleep – and wakes you gently and silently in the morning.

The discreet LED light display can display your steps, distance or calories, whichever you choose, with each lit up light showing you have achieved 20% of your target as a measure and as a motivation to get the next light lit.

The Fitbit Flex Wireless Activity and Sleep Wristband is an ideal discreet and smart wristband that keeps you in touch with how active your lifestyle is compared to what you are aiming for.

The Fitbit Flex Wireless Activity and Sleep Wristband can wirelessly sync via Bluetooth or NFC with your smartphone or tablet, giving you access to fitness and social apps where you can share and compete with friends and family.


What Flex Tracks:

*Tracks steps, distance, calories burned and active minutes

*Log food, weight and more

*Monitors how long and how well you sleep

*Wakes you (only 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 Apps

*Instantly launch your Fitbit app by tapping your device

*Easy-to-wear, slim, comfortable wristband

*Wear all day and night – even in the shower

*Rechargeable battery

How it works?

Powered by Fitbit’s leading-edge accelerometer, Flex bases calculations like calories burned on your personal profile to reflect your personal stats, not just a typical average.

Flex never sleeps, even when you do. Continue to wear it all night and it’ll measure your sleep cycle.

Your dashboard will reveal how long you slept and the number of times you woke up to help you learn how to sleep more soundly.

Flex also has a silent wake alarm that gently vibrates to wake you at your desired time without disturbing your partner.

The Fitbit Flex Wireless Activity and Sleep Wristband is your perfect companion.

It fits comfortably around your wrist so you can wear it all day and night.

The Flex is supplied with two different sized wrist bands Large and Small which can be easily switched depending on the required size.

Apps & Sync

The free Fit Bit App lets you configure and watch your progress .Available Free in App Store, Google Play Flex automatically syncs your data with iPhone 4S, 5, 5C, 5S, 6, 6Plus,  iPad 3rd Gen, Air, Mini Retina and Mini, iPod Touch  and to some Android phones (Samsung Galaxy S III & Note II) without plugging in or pushing buttons.  Please see list below with compatible devices.

This gives you real-time access to your stats on the Fitbit app throughout the day.

The Fitbit trackers are the first all-day activity trackers to offer Bluetooth 4.0 connectivity, delivering real-time stats. Flex will sync without you having to do anything. You can also sync with your phone or tablet manually, this will improve the battery live on both your devices.

There are currently 35+ Apps available in App Store and Google Play, you can install on your smartphone or tablet to help improve your stats.

Apps like Weight Watchers, Lose It, My Fit League, My Net Diary, My Fitness Pal are well-known to be preferred by most users as an online tool to track their nutrition, losing weight and burning calories.

The Map My Run App provides runners with the ability to map, record, analyse and share their exercise route and workouts with their friends.

You can also use Sleep Debt App, this will analyse your sleep data and debt. Not only you can set your alarm and it will vibrate to gently wake you at the desired time, but it will also help you catch up and clear you sleep debt by telling you what time you should go to bed, depending on how many hours of sleep you’re aiming for per night.


The Flex™ uses five LEDs to show you your daily progress. Each LED stands for 20% of your daily goal. Tap the display twice to see how far you’ve come on your way to reaching your aim.


The Flex™ uses a MEMS 3 axis accelerometer to track your movements and calculate your steps, burnt calories, travelled distance and sleep. The Flex™ also incorporates a vibration motor which can be used to wake you up silently or as a reminder.


You should synchronize your data regularly. As long as the battery is holding a minimum charge, the Flex™ can store data by the minute for up to five days. For the previous 30 days your steps, distance and burnt calories are compiled into averages.

Charging & Battery Life

The FitBit Flex is easy to charge thanks to the charging USB cable supplied.

The Flex™ lasts for five days on a full charge. While it is charging, the LED display tells you how full the battery is.

When it is fully charged, all five LEDs start blinking. You can also see the charge on your Fitbit app. Remember to charge your Flex™ every three to five days so you don’t miss any activities.

Tips to save battery

If you download the Fit Bit App, the default setting is ‘all-day sync’ which means that is constantly updating your smartphone/tablet. By switching this off, you will extend the battery life on both your phone and tracker. You can switch on/off whenever required, your data will be sync once you are connected.

Technical data

Wireless connectivity: Bluetooth Smart/4.0  & NFC

Operating temperature: -20° to 45° C

Storage temperature: -30° to 60° C

Waterproof: The device is waterproof and can be used up to a depth of 10 meters.

Battery: Lithium-polymer, lasts for up to 5 days on a full charge

Dimensions of bracelet:

Small 140 – 176 mm wrist diameter

Large 161 – 209 mm wrist diameter

14 mm wide

Compatible with the following models:

Apple iOS 5 (or higher) Required: iPod Touch 4, iPhone 3GS, iPhone 4, iPhone 4S, iPhone 5, iPhone 5S, iPhone 6, iPhone 6 Plus, iPad, iPad2,iPad3, iPad4, iPad Retina, iPad Air, iPad Air 2, iPad Mini.

*Suitable for all Apple devices running IOS 5 or later ( iPhones models released after iPhone 3GS with Bluetooth 4.0 Connection).

Android OS2.1 (or higher ) Required: Amazon Fire Phone, HTC One, HTC One M8, LG G3, LG Nexus 4, Nokia Lumia 620, Nokia Lumia 920, Nokia Lumia 925, Nokia Lumia 928, Samsung Galaxy Alpha, Samsung Galaxy Note, Samsung Galaxy Note 3, Samsung Galaxy Note 4, Samsung Galaxy Note Edge, Samsung Galaxy Note II, Samsung Galaxy S 5, Samsung Galaxy S II, Samsung Galaxy S III, Samsung Galaxy S IV, Samsung Galaxy S ,V Sony Xperia L, Sony Xperia M, Sony Xperia, SP, Sony Xperia Z Ultra, Sony Xperia Z3, Sony Xperia Z3 Compact, etc

Suitable for SmartPhones, Tablets, Pads, Laptops using Android OS4.5 or later with Bluetooth 4.0 Connection & NFC

Blackberry OS 4.5 (minimum) Required: Curve 8300, 8310, 8320, 8330, 8350i, 8900, 8910, 8980, 8530, 9300, 9330, Bold 9000, 9650, 9700, 9780, 9720, Storm 9520, 9550, Tour 9630, Style 9670, Torch 9800, 9810, 9850, 9860, Bold Touch 9900, 9930 etc..

*Suitable for Blackberry models running OS 4.5 or later with Bluetooth 4.0 Connection & NFC

Product Condition

New Other. Ex-Display models. Will be sent in padded envelope for cheaper postage.

3 Months Warranty

What is included?

Fitbit Flex Tracker

USB Charging Cable

Small Strap 140mm-177mm / 5.4inches-6.9inches

Large Strap 161mm-210mm / 6.3inches-8.3inches

Clasp to secure the strap

Fitbit Flex Setup Guide: