Fitbit flex Specification

Fitbit Flex Specifications

Sizing

•    Small
•    Large

size small
fits wrists 5.5” - 6.5”    0.6"

size large
fits wrists  6.5” - 7.9”     0.6"

Flex includes both small and large wristband. The band should be worn loosely. Download Flex Sizing Guide for more information.
Sensors and Components

•    3-axis accelerometer
•     Vibration motor

Fitbit Flex Display

•     LED display with 5 white indicator lights
•     Tap twice to see progress against your Main Goal
•     Tap rapidly for 1-2 seconds to start or stop sleep tracking

Fitbit Flex What’s Included

•    Removable Fitbit Flex™ tracker
•     2 wristbands (small and large)
•     Charging cable
•     Wireless sync dongle

Fitbit Flex Water Resistance

Fitbit Flex 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 Flex off before showering because, as with any wearable device, it’s best for your skin if the band stays dry and clean.

Care

If the band gets wet or if you sweat in it, remove and completely dry the band before putting it back on. Clean the band with a mild soap-free cleanser like Cetaphil Gentle Skin Cleanser or Aquanil. Give your wrist a rest by taking the band off every now and then. Learn more.

Fitbit Flex Materials

The Flex wristband is made of a flexible, durable elastomer material similar to that used in many sports watches. Flex also has a surgical-grade stainless steel clasp.
Battery and Power

We recommend charging your Flex every few days to ensure you are always tracking.

•     Battery life: up to 5 days
•     Battery type: Lithium-polymer
•     Charge time: One to two hours
•     Radio transceiver: Bluetooth 4.0

Environmental Requirements

•     Operating temperature: -4° to 113°F
•     Maximum operating altitude: 30,000 feet

Fitbit Flex Memory

•     Tracks 7 days of detailed motion data, minute by minute
•     Tracks daily totals for past 30 days

Syncing

Flex syncs automatically and wirelessly to tablets, computers and 150+ leading iOS, Android and Windows smartphones using Bluetooth 4.0 wireless technology.

•     Syncing range: 20 feet
•     Syncing to computers requires Internet connection and USB port
•     Syncing to mobile devices requires Bluetooth and Internet connection
•     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