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Fitbit Flex Wireless Activity Tracker


Fitbit Flex Wireless Activity + Sleep Wristband, Black: Health & Personal Care

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Amazon Price: N/A (as of July 16, 2018 8:45 pm – Details). Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on the Amazon site at the time of purchase will apply to the purchase of this product.

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Fitbit Flex

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.


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.


Wireless Activity + Sleep Wristband

This slim, stylish device is with you all the time. During the day, it tracks steps, distance, and calories burned. At night, it tracks your sleep quality and wakes you silently in the morning. Just check out the lights to see how you stack up against your personal goal. It’s the motivation you need to get out and be more active.

  • Activity tracking
  • Sleep monitor + silent alarm
  • Progress display
  • Style + accessories
  • Wear + battery Life
  • Personal dashboard

Activity tracking

Track steps taken, distance traveled, calories burned and active minutes.

Sleep monitor + silent alarm

Monitor how long and how well you sleep and wake with a silent alarm.

Progress display

See LEDs light up as you progress toward your daily goal.

Style + accessories

Style the slim, removable tracker your way with colorful accessory bands.

Wear + battery life

The Flex is water water-resistant and has a 5-day battery life.

Personal dashboard

The Fitbit app is full of graphs, charts, and tools designed to help you track your progress and better understand your health and fitness.


Product Details

  • Product Dimensions: 0.6 x 0.4 x 8.2 inches
  • Shipping Weight: 4.8 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 can be shipped to select countries outside of the U.S. Learn More
  • Origin:  Andorra
  • ASIN: B00BGO0Q9O
  • UPC: 713524579838 898628002649 713524579821 797978636835 810351020295 603470069609
  • Item model number: FB401BK
  • Batteries: 1 Lithium ion batteries required. (included)

Customer Reviews

I purchased three of these

 on January 11, 2014
By PT Cruiser
Update 12/8/15 – Fitbit just added a new firmware update for the sleep timer feature. Once updated it’s no longer necessary to tap the Fitbit before going to sleep or when waking it. It will now recognize when you’re inactive and have gone to sleep. It also has some new goal setting software in the app relating to sleep to make it easier to focus on getting more (or less) sleep. The graphic interface is pretty nice. I’m looking forward to using this since I’ve become something of a night owl and could really stand to get on a better schedule. One more thing to like about my Fitbit.

Great Motivater

 on August 31, 2015
By A Chirayil
Loving it so far. My activity levels have increased, thanks to the motivation factor. I wear it on my ankle and have tested step count various times, and it seems highly accurate. When I cycle, it adds steps too, about a 1000 per 15 minutes of moderate cadence.

Helped diagnose my sleep apnea!

 on December 6, 2015
By Illtakepink
I’ve had this for a couple of months and it has really made me realize how lazy I am. My physician added my Fitbit info into my digital chart and it has been very helpful.
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