48-Hour Flash SaleEnds Tuesday. 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 384 Showing 7,661-7,680 of 10,464 reviews
  • Pros mentioned:
    Sleep tracking

    Great Device To Keep Up With Daily Activity

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

    Use this device on a daily bases to keep up with my daily activity and goals.

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

    Great workout gear!

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

    We purchased this device for our daughter and she really likes it, and uses it daily!

    I would recommend this to a friend

  • Great product

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

    The silent alarm is very convenient. It wakes me up with out waking everyone else up.

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

    I would recommend this to a friend

  • Great for tracking steps.

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

    This is a great product. Makes you want to get up and move more to meet daily goals.

    I would recommend this to a friend

  • Love my Fitbit

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

    Fitbit motivates me to reach my exercise goals every day. Almost as addictive as Facebook.

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

    I would recommend this to a friend

  • good fitness band

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

    I bought the band for my wife. Was a bit skeptical at first, but it has really helped her track her workout routine success. She loves it. The only issue that she has with it is that it needs a reboot of the phone on occasion to sync up data. (Samsung Galaxy III) Not a deal breaker, just a little bit of a annoyance.

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

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

    easy to use

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

    easy to use. you just put it on and forget about it.

    I would recommend this to a friend

  • Great but comes off too easily

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

    Great motivation tool. Needs to be easier to remove and reinstall for battery charging.

    I would recommend this to a friend

  • Numbers it recorded were not always correct

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

    Actually changed it for another model that also recorded heart rate info.

    No, I would not recommend this to a friend
  • Pros mentioned:
    Step tracking

    Great for keeping track of health

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

    Great for keeping track of steps taken per day, sleep evaluation, and general health

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

    Great motivator! Gets you moving!!

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

    Great product. Good value for the money. Love the sleep feature. So much it can do though!

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

    Love my Fitbit Flex

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

    Mainly wanted a device for tracking my steps, and the Flex fits the bill!

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

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

    Gift

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

    This was for my daughter and she loves it. Helped her keep track of calories burned.

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

    I would recommend this to a friend

  • great motivator

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

    Great motivator. Will buy another one for spouse so we can track everything together.

    I would recommend this to a friend
  • Pros mentioned:
    Battery life

    Good Product

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

    Got this for my wife and she loves it. It keeps a charge and works great.

    I would recommend this to a friend

  • Great for tracking steps

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

    I love my Fitbit Flex! It's so slim sometimes I forget I even have it on.

    I would recommend this to a friend

  • Good

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

    It was a good fitness tracker but i felt like i needed more of a watch

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

    I would recommend this to a friend

  • Great Health Tracker

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

    Although the FitBit Flex has a lot going for it — and can truly be integrated into almost any lifestyle — it's possible that the biggest advantage to having any wristband health tracker is that it's a constant reminder to stay active. Even for people who aren't hitting the gym every day, a tangible device which sits on your wrist and occasionally blinks and vibrates is a gentle nudge to stop sitting around.

    I would recommend this to a friend
  • Cons mentioned:
    Charging

    Excellent product!

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

    Only draw back is having to take it off to charge, I hate to be without it!

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

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

    Easy order - product just as I expected

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

    Like it very much - easy to use-no issues. product just as I expected

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

    I would recommend this to a friend
Page 384, Showing 7,661-7,680 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.