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6 Colors: Black
2 Sizes: Two wristbands included, Large (6.5 - 7.9 in) and Small (5.5 - 6.5 in)
Two wristbands included, Large (6.5 - 7.9 in) and Small (5.5 - 6.5 in)
Select in
Two wristbands included, Large and Small
Select in



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Fitbit Flex Wireless Activity + Sleep Wristband, Black

3.6 out of 5 stars 22,286 customer reviews

About the product
  • Rubber
  • Made in USA or Imported
  • One syncs automatically and wirelessly to tablets, computers and 150+ leading iOS, Android and Windows smartphones using Bluetooth 4.0 wireless technology. Syncing to computers requires Internet connection and USB port. Syncing to mobile devices requires Bluetooth and Internet connection. Syncing range: 20 feet. Call notifications via Bluetooth 4.0
  • Water Resistance: Charge has been tested up to 1 ATM meaning it is sweat, rain and splash proof. However, the device is not swim proof. We also recommend taking Charge off before showering because, as with any wearable device, it’s best for your skin if the band stays dry and clean.
  • Warning: Do not use if you have a pacemaker or other internal, or implanted medical device. Not intended for use by children under 13. Always consult your physician. Slippery when wet
  • We recommend charging your device every few days to ensure you are always tracking. Charge time: One to two hours. Battery life: up to 7 - 10 days. Battery type: Lithium-polymer
  • Syncs with Windows Vista and later, Mac OS X 10.6 and up, iPhone 4S and later, iPad 3 gen. and later, and leading Android and Windows devices
  • Tracks steps, distance, calories burned and active minutes
  • Monitor how long and well you sleep
  • Wakes you (and not your partner) with a silent wake alarm
  • LED lights show how your day is stacking up against your goal
  • Slim, comfortable and easy to wear (sold with both large and small wristbands included with an interchangeable clasp)
  • Sync stats wirelessly and automatically to your computer and over 150 leading smartphones
  • 1 wristband which acts both as an Activity & Sleep wristband. There is no seperate Sleep wristband.

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From the manufacturer

Product description

Color:Black  |  Size:Two wristbands included, Large (6.5 - 7.9 in) and Small (5.5 - 6.5 in)

Product Description

Make fitness a lifestyle with Fitbit Flex—a slim, stylish device that tracks all-day activity like steps, distance, calories burned and active minutes. See how every day stacks up with LEDs that light up like a scoreboard as you get closer to your goal. Then wear it at night to measure your sleep quality and wake with a silent, vibrating alarm. Day or night, Flex fits comfortably around your wrist, is water-resistant, and has a 5-day battery life. It also syncs to computers and 150+ leading smartphones, so you can access your stats anywhere and see your progress in charts and graphs.

FREQUENTLY ASKED QUESTIONS

What mobile devices are supported for syncing?

The Fitbit Flex can sync directly to select iOS and Android devices. IOS: iPhone 4S, iPhone 5, 5S, 5C, iPod Touch (5th gen.), iPad 3, iPad 4, iPad mini. Android: Samsung Galaxy Note 10.1, Samsung Galaxy Note II, Samsung Galaxy S III, Samsung Galaxy S4

How do I charge my flex?

Your tracker battery lasts for about 5 days. To charge it, remove the tracker from the band and place it in the charger until all 5 lights are solid.

If you are having trouble, your tracker's charging contacts may be obstructed by microscopic dirt or debris that prevents them from making a good connection to the charger. Use hand sanitizer and a tissue or dampen a cotton swab with rubbing alcohol and carefully clean the charging contacts on your tracker. Do not submerge your tracker in water or use abrasive cleaners. Thoroughly dry your tracker before attempting to charge. Be sure to fully seat your tracker into the charger, with the charging contacts fully inserted into the charging cable enclosure.

How do I reset my tracker?

lf your tracker is not responding, it may be fixed by restarting.

1. Plug your charging cable into the USB port and insert your tracker into the charging cable.
2. Insert a paperclip into the small pinhole on the back of the charger.
3. Press on the pinhole for 3-4 seconds.

Your Flex will now be reset. Take your tracker out of the charger and insert it back into the wristband.

Can the wristband irritate my skin?

The Flex wristband is made of a flexible, durable elastomer material similar to that used in many sports watches. It does not contain latex. The clasp is made of surgical-grade stainless steel and contains traces of nickel. As with any type of jewelry, some people may experience allergies. Numerous factors can cause an allergy, such as a nickel sensitivity, reactions to bacteria that can accumulate in watch wristbands or other wearable devices, a reaction between the wristband and your soap or perspiration, or an allergy to the material of the wristband. If you notice any signs of skin irritation or experience any discomfort, please discontinue use.

From the Manufacturer

• Certain features like Auto Sleep Tracking and SmartTrack may be disabled when using this accessory. Classic accessory bands are the recommended accessory for high intensity workouts and sleep tracking. • Do not wear the Flex 2 Pendant accessory while sleeping or during high intensity activity, as doing so could create a choking hazard. • Flex 2 Pendant accessories contain magnets. Magnets may interfere with pacemakers, defibrillators, or other medical devices. Consult your physician and the manufacturer of your medical device before using to determine if these accessories are safe for you. If the accessories may be interfering with your pacemaker, defibrillator, or other medical device, do not wear the accessories.

See all Product description

Product details

Color: Black | Size: Two wristbands included, Large (6.5 - 7.9 in) and Small (5.5 - 6.5 in)
Manual [PDF]|Product Warranty: For warranty information about this product, please click here. [PDF]
  • Product Dimensions: 0.6 x 0.4 x 8.2 inches ; 4 ounces
  • Shipping Weight: 4 ounces
  • Domestic Shipping: Currently, item can be shipped only within the U.S. and to APO/FPO addresses. For APO/FPO shipments, please check with the manufacturer regarding warranty and support issues.
  • International Shipping: This item is not eligible for international shipping. Learn More
  • ASIN: B00BGO0Q9O
  • UPC: 713524579838 745750683690 898628002649 043396312937 810351024798 810351024606 810351020295 898628002663 656107328419 603470069609
  • Item model number: FB401BK
  • Batteries Lithium Metal batteries required. (included)
  • Average Customer Review: 3.6 out of 5 stars 22,286 customer reviews
  • Amazon Best Sellers Rank: #15,851 in Health & Household (See Top 100 in Health & Household)
  • Product Warranty: For warranty information about this product, please click here. [PDF]

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Customer Questions & Answers

Customer Reviews

Rated by customers interested in
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Top customer reviews

January 11, 2014
Color: Black|Size: Two wristbands included, Large (6.5 - 7.9 in) and Small (5.5 - 6.5 in)|Verified Purchase
4,764 people found this helpful
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May 17, 2013
Color: Black|Size: Two wristbands included, Large (6.5 - 7.9 in) and Small (5.5 - 6.5 in)|Verified Purchase
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4,090 people found this helpful
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June 12, 2017
Color: Slate|Size: Two wristbands included, Large (6.5 - 7.9 in) and Small (5.5 - 6.5 in)|Verified Purchase
12 people found this helpful
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