Fitbit Flex Wireless Activity + Sleep Wristband, Black, Small/Large

Price: $99.95
(as of Oct 04, 2026 00:05:37 UTC – Details)


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 you’re stacking up against your daily goals. At night, it tracks your sleep cycle, helps you learn how to sleep better, and wakes you silently in the morning. Access your stats anytime on your computer, tablet or from leading smartphones – both iPhone and Android. Flex is your perfect companion, it’s with you everywhere… even in the shower. Plus, it looks good no matter what you’re wearing.
Product Dimensions ‏ : ‎ 0.6 x 0.38 x 8.2 inches; 3.2 ounces
Item model number ‏ : ‎ RZS-000-01
Department ‏ : ‎ unisex-adult
Batteries ‏ : ‎ Lithium Metal batteries required. (included)
Date First Available ‏ : ‎ March 11, 2013
Manufacturer ‏ : ‎ Fitbit Inc
ASIN ‏ : ‎ B00BGO0Q9O
Best Sellers Rank: #894,221 in Sports & Outdoors (See Top 100 in Sports & Outdoors) #3,490 in Activity & Fitness Trackers
Customer Reviews: 3.9 3.9 out of 5 stars (22,317) var dpAcrHasRegisteredArcLinkClickAction; P.when(‘A’, ‘ready’).execute(function(A) { if (dpAcrHasRegisteredArcLinkClickAction !== true) { dpAcrHasRegisteredArcLinkClickAction = true; A.declarative( ‘acrLink-click-metrics’, ‘click’, { “allowLinkDefault”: true }, function (event) { if (window.ue) { ue.count(“acrLinkClickCount”, (ue.count(“acrLinkClickCount”) || 0) + 1); } } ); } }); P.when(‘A’, ‘cf’).execute(function(A) { A.declarative(‘acrStarsLink-click-metrics’, ‘click’, { “allowLinkDefault” : true }, function(event){ if(window.ue) { ue.count(“acrStarsLinkWithPopoverClickCount”, (ue.count(“acrStarsLinkWithPopoverClickCount”) || 0) + 1); } }); });
Rubber
Made in USA or Imported
One syncs automatically and wireless to tablets, computers and 150+ leading iOS, Android and Windows smartphones using Bluetooth 4.0 wireless technology. Syncing two 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)
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.
Customers find the Fitbit Flex works well and appreciate its sleep tracking capabilities. However, the battery life is problematic as it stops holding a charge, and customers report durability issues with the band breaking within three months. Moreover, customers disagree on the ease of use, with some finding it very hard to put on, and the value for money receives mixed reviews, with some considering it well worth the money while others say it’s a waste of $100. Additionally, customers disagree on the device’s reliability, with some saying it does everything it says while others find it unreliable.