Winter SaleEnds 1/19. Limited quantities. No rainchecks.Shop now

Skip to contentGo to Product SearchGo to Footer
Main Content

Customer Ratings & Reviews

No content
  • Front. Fitbit - Flex Wireless Activity and Sleep Tracker Wristband - Black.
  • Angle. Fitbit - Flex Wireless Activity and Sleep Tracker Wristband - Black.
  • Alt View 1. Fitbit - Flex Wireless Activity and Sleep Tracker Wristband - Black.
  • Alt View 3. Fitbit - Flex Wireless Activity and Sleep Tracker Wristband - Black.
  • Alt View 4. Fitbit - Flex Wireless Activity and Sleep Tracker Wristband - Black.
  • Alt View 5. Fitbit - Flex Wireless Activity and Sleep Tracker Wristband - Black.
  • Alt View 6. Fitbit - Flex Wireless Activity and Sleep Tracker Wristband - Black.
  • Alt View 11. Fitbit - Flex Wireless Activity and Sleep Tracker Wristband - Black.

Fitbit - Flex Wireless Activity and Sleep Tracker Wristband - Black

Model:
FB401BK
SKU:
8390054
Highly rated by customers for:
Your price for this item is $31.99
Clearance
The comparable value price is $79.99

Customer reviews

Rating 4.4 out of 5 stars with 10464 reviews

Rating Filter

Pros mentioned filter

Cons mentioned filter

92%
would recommend
to a friend

Customers are saying

Customers are satisfied with the Flex Wireless Activity Tracker's sleep tracking, ease of use, and accurate step tracking capabilities. Many appreciate the long battery life, comfortable size and weight, and the motivational aspects of the device. While some users mentioned challenges with the charging mechanism, clasp, and price point, the positive feedback on core features outweighs these concerns. The water resistance and alarm features also received positive comments.

This summary was generated by AI based on customer reviews.

The vast majority of our reviews come from verified purchases. Reviews from customers may include My Best Buy members, employees, and Tech Insider Network members (as tagged). Select reviewers may receive discounted products, promotional considerations or entries into drawings for honest, helpful reviews.
Page 252 Showing 5,021-5,040 of 10,464 reviews

  • Gift for the wife

    |
    |
    Posted .
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    Bought for the wife. So far she loves it and thats all I can ask for.

    I would recommend this to a friend

  • Great product

    |
    |
    Posted .
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    Wish it would work with the Iphone4 it would buy another for my daughter.

    I would recommend this to a friend
  • Pros mentioned:
    Ease of use

    Easy for starter

    |
    |
    Posted .
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    Easy to setup, especially on Mac and iPhone. Sometimes when it is just bumped it shows progress or switches to sleep tracking. I originally had the Force which seemed nicer but with reports of rashes and it isn't as water resistant so switched to Flex.

    I would recommend this to a friend

  • common ailment with fitbits

    |
    |
    Posted .
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    There is common knowledge that at times fitbits will need to be reset.

    I would recommend this to a friend

  • It's okay

    |
    |
    Posted .
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    It is okay. Does not do as much as I thought but is cool and I like it.

    I would recommend this to a friend

  • Great motivator!

    |
    |
    Posted .
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    My favorite part about this item is that it tracks so many different stats, that it encourages you to get off the couch!

    I would recommend this to a friend

  • Cost too much for what it does

    |
    |
    Posted .
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    My friend got me into buying a FITBIT product and it's fun to use but too much for what it is capable of doing. Now they have the MOTO 360 and I'm getting one. If my FITBIT was waterproof I'd give it a 5 star. I got the sleep and exercise tracker. I didn't get the one that came with the time/watch.

    No, I would not recommend this to a friend

  • Good way to measure activity

    |
    |
    Posted .
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    Doesn't always record all activity consistently. But overall, pretty good.

    I would recommend this to a friend

  • Great product to help to fit!

    |
    |
    Posted .
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    FitBit is a great motivator to get fit. Day by day I was encouraged to top the prior day with better performance today!

    This review is from Fitbit - Flex Wireless Activity Tracker - Teal

    I would recommend this to a friend

  • Best activity app available

    |
    |
    Posted .
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    Fitbit got I right, right metrics, right fit, right look, right dependability, right customer support, love our fitbit

    This review is from Fitbit - Flex Wireless Activity and Sleep Wristband - Pink

    I would recommend this to a friend

  • easy to use

    |
    |
    Posted .
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    just what i wanted just the basic facts. Perfect as my Christmas gift

    I would recommend this to a friend

  • Fitbit One

    |
    |
    Posted .
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    This is my second Fitbit One. The first was sent through the washer and died. I got the 2 year warranty with this one.

    I would recommend this to a friend

  • not just a put it on device

    |
    |
    Posted .
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    Lots of tweaks, and info to put in before it works well or accurately

    This review is from Fitbit - Flex Wireless Activity Tracker - Teal

    I would recommend this to a friend

  • Fitbit

    |
    |
    Posted .
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    Works like it should. Previously bought a different brand and was not happy. I have had no issues with the fitbit

    This review is from Fitbit - Flex Wireless Activity and Sleep Tracker Wristband - Slate

    I would recommend this to a friend

  • Excellent product

    |
    |
    Posted .
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    This was a gift; but it arrived at my home right on time. It was packaged well and was exactly what I expected it to be.

    I would recommend this to a friend
  • Pros mentioned:
    Sleep tracking

    Great tool

    |
    |
    Posted .
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    Adding this to my routine works much better than trying to remember my phone all the time. Plus it monitors my sleep. Entering food is not as good as My Fitness Pal which it is supposed to work with, but I have yet to make them sync

    I would recommend this to a friend

  • Fit Bit

    |
    |
    Posted .
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    It works okay I had to read up on it to figure out how to make it work.

    I would recommend this to a friend

  • Excellent

    |
    |
    Posted .
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    I love the Fitbit Flex. It accurately measures my every day workout life as well as my gym life and other exercise life. While the battery is a bit disappointing, it is adequate. That is the only matter that I quibble with. Five days just isn’t enough. I love the silent alarm waking up in the morning. Good job (except for the battery).

    This review is from Fitbit - Flex Wireless Activity and Sleep Tracker Wristband - Slate

    I would recommend this to a friend

  • Like it

    |
    |
    Posted .
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    A few little issues, but overall good product. Happy with the purchase...

    I would recommend this to a friend

  • I really liked this product!

    |
    |
    Posted .
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    I am happy with this purchase and would recommend it to a friend or anybody.

    This review is from Fitbit - Flex Wireless Activity Tracker - Teal

    I would recommend this to a friend
Page 252, Showing 5,021-5,040 of 10,464 reviews
Sign in or Create Account

Get the latest deals and more.

Best Buy appLearn more
Share on YouTubeShare on InstagramShare on TikTokShare on FacebookShare on PinterestShare on X
Best Buy Canada
AccessibilityTerms & ConditionsPrivacyInterest-Based AdsState Privacy RightsHealth Data PrivacyDo Not Sell/Share My Personal InformationLimit Use of My Sensitive Personal InformationTargeted Advertising Opt OutCA Supply Chain Transparency Act
In-store pricing may vary. Prices and offers are subject to change. © 2026 Best Buy. All rights reserved. BEST BUY, the BEST BUY logo, the tag design, and MY BEST BUY are trademarks of Best Buy and its affiliated companies.