Fitbit Flex (Slate)

Flex™ Wireless Activity And Sleep Tracker Wristband

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Fitbit One


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.


Flex never sleeps, even when you do. Continue to wear it all night and it’ll measure your sleep quality. Your dashboard will reveal how long you slept and the number of times you woke up to help you learn how to sleep more soundly. Flex also has a silent wake alarm that gently vibrates to wake you at your desired time, without disturbing your partner.


Flex is your perfect companion. It fits comfortably around your wrist so you can wear it proudly all day and night. Flex also allows you to set a goal and uses LED lights to show how you're stacking up. Each light represents 20% of your goal. You choose which one — steps, calories, or distance. It lights up like a scoreboard, challenging you to be more active day after day.

The Fitbit One™ Tracks:
  • Steps Taken
  • Calories Burned
  • Distance Traveled
  • Active Minutes
  • Hours Slept
  • Quality of Sleep

General Features:

  • The Fitbit Flex™
  • Track your activity and sleep
  • Sync stats to your computer/smartphone
  • Visualize your progress through free graphs, charts and other tools
  • Challenge friends, set goals and earn badges with the Fitbit App
  • Silent wake alarm to awake with a gentle vibration
  • Discreet, comfortable wristband design
  • Includes small and large interchangeable wristbands
  • Built-in rechargeable battery
  • Operating Time: 5-7 days
  • Rain, splash and sweat-proof
  • Achievement alerts for when you're close to your goals
  • Log your activities and meals easily with the free Fitbit app
  • Color: Slate
  • Also available in Black
  • Clip style models, One Black and One Burgundy also available
  • 1-year Manufacturer's Warranty

Fitness Tracker Design

Wearing Style
This refers to how you wear the fitness tracker device. Some are clip on style while some feature the comfortable wristband style.
Wristband Size
This refers to the size of the fitness tracker's wristband. The wristbands come in Small, Medium, or Large. Some fitness trackers come with more than one wristband, here you will find which sizes the device comes with.

Small: Fits wrists 5.5"-6.9" in diameter.

Medium: Fits wrists around 5.8"-6.3" in diameter.

Large: Fits wrists around 6.3"-8.2" in diameter.

Controls Type
This refers to what type of controls the fitness tracker device features. They can either have buttons, a touch screen display, or have no buttons on the device.
LED Buttons
Water Resistant
This refers to the level of water resistance of the fitness tracker. Some fitness trackers are water resistant and can be used while swimming, while others are only splash proof or should not be used near the water.
Maximum Operating Altitude
Maximum operating altitude is the maximum height in feet that you may take the device while having it still tracking your movements.
30000 feet
Primary Color (Fitness Trackers)
This is the main color of the item.
LED Status Indicators
This refers to if there is any LED illumination present on the fitness tracker.
Display Type (Fitness Trackers)
This refers to what type of display the fitness tracker device features. Some of them have LCD screens while others have an LED display or no display at all.

Connectivity Features

Compatible Smartphone Apps
This refers to which smartphone apps the fitness tracker device will connect with and send your recorded fitness data to.
Lose It!
Map My Fitness
My Fitness Pal
Run Keeper
Spark People
Compatible Devices (Fitness Trackers)
This refers to which smartphone and computer operating systems the fitness tracker device is compatible with. Fitness trackers can only sync and connect with their compatible devices.

iOS: Compatible with iPad, iPod and iPhone.

Android: Compatible with all Android smartphones.

Mac: Compatible with all Macintosh computers.

PC: Compatible with all Windows computers.

Sync Type
Sync type refers to how the fitness tracker device sends the recorded data to your compatible computer or smartphone.

Wireless means that the fitness tracker syncs your data through a connected WiFi network.

Bluetooth means that the fitness tracker has Bluetooth built in and sends your recorded data to a Bluetooth connected device.

Wired means that the fitness tracker device can transfer the recorded data by connecting your device through USB.


Functionality Features

Charging Type
This refers to how you would charge the battery in the device.
USB Cable
Battery Life (Fitness Trackers)
The average capacity of the battery when fully charged. This value is provided by the manufacturer and is an average, not a guarantee.
120 hours
Countdown Timer/Stopwatch
Some fitness trackers feature a countdown timer or a stopwatch for an added feature to use while you are active.
Sensor Type (Fitness Trackers)
Currently, fitness trackers will typically use an accelerometer sensor type. Some will use an altimeter.
Clock (Fitness Trackers)
This refers to whether the device has a built-in clock or not.
Alarm Type
This refers to the type of alarm the fitness tracker has built-in to the device. Some fitness trackers use a vibration alarm while other use either a sound alarm, have no built-in alarm, or allow you to select the type of alarm you use.
Device Tracks
This refers to what the fitness tracker device will record from your movements or sleep.
Active Minutes
Calories Burned
Distance Traveled
GPS Location
Sleep Information
Steps Taken

Warranty and Return Policy

Parts Warranty Duration
1 year
Labor Warranty Duration
1 year
Warranty Provider

Summary of Customer Ratings & Reviews

Rating Distribution

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Sonic Electronix Wiring Guide

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Warning: The image depicted shows the resistance change when wiring multiple subwoofer terminals. Please refer to your subwoofer's owner's manual for the proper wiring of its terminals. Sonic Electronix, Inc. is not responsible for damage caused to your audio system or vehicle due to improper installation. Please call tech support at 1-877-289-7664 if you require additional assistance.

Product Name: Fitbit Flex (Slate)

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Fitbit Flex (Slate)

Flex™ Wireless Activity And Sleep Tracker Wristband


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