Woah there, it looks like your browser is out of date.

To get the best experience, please update your browser.

Fitbit Flex Wireless Activity + Sleep Tracker, Black, 1 ea

BY FITBIT #12 in Fitness Equipment

4.3 out of 5 stars
  • 5 Stars55%
  • 4 Stars31%
  • 3 Stars11%
  • 2 Stars3%
  • 1 Star1%
4.36 / 5 based on 608 Reviews

Product Description

Set a Goal Go. Make it Your Lifestyle. Make Fitness Part of Your Everyday Lifestyle Put it On. Set a Goal. Go! Tracks Steps, Distance, Calories Burned Active Minutes 5 Monitor How Long How Well You Sleep 3 Wakes You with a Silent Wake Alarm 1 LED Lights Show How Your Day is Stacking up Against Your Goal 2 Easy-to-Wear, Slim, Comfortable Wristband 6 Syncs Automatically with Select Mobile Devices to Your Computer 10 Stylish Black Color 11 Accessory Bands Allow You to Personalize Your Flex 9 Set Goals, View Progress, Earn Badges 7 Share Compete with Friends Throughout the Day 8 Free iPhone Android App 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 youre stacking up against your daily goals. see more...

Top Questions See all 98 Q&A

  • I would really like to try this because I see a lot of people usi...5 Answers
  • Fitbit flex or Fitbit Charge HR which do you prefer and why! 5 Answers
  • Just wondering what the differences are between a FitBit Flex and...5 Answers
Fitbit Flex Wireless Activity + Sleep Tracker, Black, 1 ea
Fitbit Flex Wireless Activity + Sleep Tracker, Black, 1 ea
Reviews (608)
Q&A (98)
Media (42)
Leave a Review
  • "Tracks all sorts of things, heart rate, pedometer, sleep, stairs, activity, calories burned, and you can go to site to update and input your foods eaten, etc." in 6 reviews
Ashley W.
Waukegan, IL
224 reviews
I received this as a gift from a family member. I think that it is a bit pricier than I would personally spend; I probably wouldn't buy one with my own money. I received three coloured bands: black, gray-blue, and red. I don't like the little pegs that you push through the holes to secure the bands on your wrist. It is nice that you can adjust it, but compared to my old Microsoft Band and for the cost of the Fitbit, I think they could've made that part better. The band, once adjusted properly, is comfortable on my wrist. Sometimes I forget that its there because I hardly feel it. It is at least water resistant, because I forgot to take it off several times while doing the dishes, it has been exposed to the rain, and once it partially fell in a puddle when I was adjusting the strap while outdoors; so far it hasn't had any adverse reactions to a tiny bit of water.

Otherwise, though, the battery charges pretty quickly, and lasts for quite some time. I have an Android phone, and the app notifies me when I need to charge the battery. The charger is a short USB cable type, and is easy to use as it is shaped very specifically. I wish this version had a little screen that displays the time. The app is very useful, and syncs pretty easily with my Fitbit. I like that I can add friends and cheer them on or participate in challenges/contests. I also really enjoy that it has a food, water, and sleep log. I enjoy having a steps goal set, and always look forward to feeling the vibration on my wrist and seeing the lights flash to indicate that I met my goal. Its also nice that the app tracks exercise. Overall I like this product, though I think for the cost there could be a few more features.
Tonya S.
Carol Stream, IL
41 reviews
This is a great device for tracking your activity as well as sleep. The flex while capable of tracking steps, distance, calories burned, hours of activity and sleep does not track your heart rate or the stairs you climb. So if you're looking for something that in depth the flex might not be for you.
As far as I know it is pretty accurate. I wear mine walking to and from school which is about three quarters of a mile each way and my flex has always been accurate.
The downsides to the flex aside from not tracking heart rate and stairs climbed is that it is kind of a clunky accessory. Even with the added band colors, which is definitely an improvement, the armband is still not that flattering. And the second is that your progress shows up as little flashing dots, which represent your progress in completing your goal. For me it is 10,000 steps a day so each solid dot that shows up is equivalent to 2,000 steps. But if I want an accurate down to the step count I have to check the fitbit application on my phone, which does allow for it to auto sync.
All in all it is a nice accessory. It is convenient to wear all the time. It's water proof so it can be worn in the shower. The newer flex allows for it to automatically move between tracking your sleep and your activity. The phone application can be set to auto sync. When your batter is low the application will inform you as well as receiving an email. On top of all that you receive weekly fitness reports via email, which shows your combined data for the week.
Eden B.
Saratoga Spgs, UT
184 reviews
I really like my fitbit but I took away a star because after only owning it less than a year, there are newer, nicer models available that do way more than this product. While I understand that is a good thing, who can afford to upgrade that often? I bought mine at Kohls using Kohls cash so it wasn't too expensive. They were around 99 dollars full price.
The other issue I have it that it I'm not sure about the accuracy. I use a treadmill at the gym regularly . The miles and the steps are never the same as what is reflected on my fitbit. I think its because when I'm walking uphill on an incline, I grab the top of the machine quite a bit. When my arm is stationary it doesn't track thoses steps. That drives me crazy! Then I either have to manually adjust the steps on the app or guesstimate, which defeats the whole purpose. I don't sleep with mine on. It don't like to have things around my wrist when I sleep.
Maria B.
Chicago, IL
92 reviews
My dad gave me the flex since he got an extra one. For the most part I think the flex gets the job done. It's pretty basic and easy to use. I do wish that you could see how many steps you've taken instead of having to constantly look at your phone. I also wish it would tell me the time, since I'm always running on a schedule and need a watch. Last thing, I wish the battery on these thing a lasted a little longer. I typically go about 3-4 days before having to charge mine. What I do like is that it tracks your sleeping pattern. It's a pretty nice feature that lets me know how long I've slept and type of sleep. Overall, I think this is a good beginner tracker. As far as price is concerned, I ALWAYS do some research and see what stores or websites have deals going on or coupons.
Logan A.
Jacksonville, FL
65 reviews
I've had my Fitbit flex for almost a year now and it's my favorite every day fitness tracker! I have the Tory Burch rose gold band to go with it so you can't even tell I'm wearing a Fitbit! This band is great for everyday use such as tracking your steps and sleep (especially since it'll automatically recognize when you're sleeping, so great!), but I ended up purchasing the Fitbit Surge to use when I'm exercising because it tracks my heart rate and displays everything on my watch so I don't have to pull out my phone. Because this one doesn't have a heart rate monitor it has to assume how many calories you're burning so it's not as accurate. Very basic and great for people who are just starting out, it just didn't do enough for me to be satisfied only using this one!
Leslie T.
Casper, Wy
131 reviews
I got the flex in Aug of 2014 right after they came out. The Pros- it is affordable and tracks your steps, sleep, alarm and estimated calories. The cons are that it does not do HR, stairs, no clock/date display, and no Bluetooth to alert you of numbers calling. It is nice having an app on your phone, which you can set to push sync or continually sync. There are white dots that signify multiple things in response to tapping your fitbit. The customer service is amazing, but durability not so much. It says to wear it in your sleep and during your day- yet the bands tear very easy! Luckily you can just replace the band on this style.
Jen G.
Chapel Hill, NC
34 reviews
I got the Fitbit Flex a few years ago and just love it. So motivating and easy to sync as well. I don't like that the bands are very flimsy and break faster than you would expect. It is because you have to take the tracker out of the band every time you need to charge it and it wears on the band eventually breaking. The clasp isn't that secure either, so if you are gardening it can easily come off it caught on something. I think the newer models have corrected this issue however they are expensive. I got this one for free at a company raffle - otherwise I wouldn't own it.
Haley B.
Evansville , IN
199 reviews
So if you are looking for something to count your steps and keep you active for a good price the flex is for you. I have also used the Charge but lost it so I had to go back to the flex. I don't like that it is just blinking lights that counts your steps. I wish it showed the number like the charge and others do. But the app on your phone opens up to show all kinds of things like number of steps, hours of sleep, miles walked. It really makes me want to move seeing that I'm close to my 10,000 step goal by the end of the day. Fitbits are great products.
Nicole A.
Roanoke, VA
124 reviews
This is something I cannot live without but it definitely has some room for improvement. The band is unreliable and I've already lost a few trackers when the band has unsnapped without my noticing. Disappointing because these things aren't cheap. I love the pedometer aspect and like that I can interact with my friends and participate in "challenges," but I've been most impressed by the sleep tracker. It really has been eye-opening to see the quality of my sleep and be able to work towards improving it.
Jaime E.
Oklahoma City, OK
39 reviews
I actually received this for free from my work as a reward for participating in a steps contest. I love it. Counting the steps is one thing, but tracking my sleep is another thing. It is a plus, because it allows me to see when I get too much sleep or do not get enough. This is important as I need all the energy I can get as I am a full time employee and working on my MBA in the evenings.

I also like how the app allows you to compete with your friends, because it does make it fun.
Lidia Z.
217 reviews
How long did your first band last?
Heather H.
76 reviews
How comfortable is the Fitbit to wear during sleep?
Lisa D.
Pittsburgh, PA
26 reviews
I have been looking into getting one of these but I am not sure it is worth it? Is this waterproof? Would you advise taking this off when showering or swimming>? Is this good for runners?
Courtney M.
Fayetteville, AR
20 reviews
Is the flex waterproof?
Pamela G.
Summerville, SC
135 reviews
I've been looking into getting a Fitbit. I simply want something that will track my steps, sleep and calories. I've heard that the Fitbit doesn't really work though. Is this true? Is it a helpful product to own?

Join now to gain access to over 20 million product reviews, free full size samples, and the latest product news.

Get Started

Are you a Brand or Agency? Contact Us