Get fit. Sleep better. All in One.

One One

Wireless Activity + Sleep Tracker

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One powerful, motivating tracker.

All-Day Activity

Find fitness
everywhere you look.

See how every step adds up with One, which tracks all-day activity like steps taken, distance traveled, floors climbed and calories burned.

See how every step adds up with One, which tracks all-day activity like steps taken, distance traveled, floors climbed and calories burned.

Clock + Display

See everyday
on display.

Get motivated to meet your goals with a tracker that keeps daily stats and time on display. One shows all your activity with the push of a button—giving you the encouragement you need to be more active and make better choices throughout the day.

Get motivated to meet your goals with a tracker that keeps daily stats and time on display. One shows all your activity with the push of a button—giving you the encouragement you need to be more active and make better choices throughout the day.

Sleep + Alarms

Know your day
from A to ZZZs

Measure your sleep quality at night by slipping One into the sleep wristband that’s included with your tracker. Then, set a silent alarm to wake with a gentle vibration that won’t disturb your partner.

Measure your sleep quality at night by slipping One into the sleep wristband that’s included with your tracker. Then, set a silent alarm to wake with a gentle vibration that won’t disturb your partner.

Wireless Syncing

All your stats,
always in sync.

One syncs your daily stats to your computer and 150+ leading smartphones, and shows your progress in easy-to-read charts and graphs, so you can see how close you are to your goals—anytime, anywhere.

One syncs your daily stats to your computer and 150+ leading smartphones, and shows your progress in easy-to-read charts and graphs, so you can see how close you are to your goals—anytime, anywhere.

Wear + Life

By your side,
day and night.

One clips securely and discreetly onto your pocket, belt or bra, has a battery life of up to 14 days*, and is rain, splash and sweat-proof—so no matter what your week looks like, you’re always ready to make it count.

One clips securely and discreetly onto your pocket, belt or bra, has a battery life of up to 14 days*, and is rain, splash and sweat-proof—so no matter what your week looks like, you’re always ready to make it count.

Everything you need, all in one place.

A seamless app experience from devices to dashboard

Learn more

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Specifications

Sizing

  • Tracker
  • Clip
19.3 mm
9.65 mm
48 mm

What’s Included

  • Fitbit One™ tracker
    Charging cable
    Wireless sync dongle
  • Silicon clip
    Sleep wristband
see more specs

Sensors and Components

  • 3-axis accelerometer
  • Altimeter
  • Vibration motor

Display

  • OLED display
  • Push the button to cycle through daily stats

Battery and Power

We recommend charging your One weekly to ensure you are always tracking.

  • Battery life: 10-14 days
  • Battery type: Lithium-polymer
  • Charge time: One to two hours
  • Radio transceiver: Bluetooth 4.0

Memory

  • Tracks 7 days of detailed motion data – minute by minute.
  • Tracks daily totals for past 23 days

Water Resistance

One is sweat, rain and splash proof. However, the device is not swim proof. With any clip-based wearable device, it’s best for your skin if the clip stays dry and clean.

Care

You can clip One to a belt, pocket or bra. Always use the silicone holder when clipping it to a bra or waistband as the plastic One tracker is not meant to be worn in direct contact with the skin. Make sure the One display faces outward when clipped to your bra. Learn more

Materials

The One tracker is made of thermoplastic. The clip is made of silicone and metal.

Environmental Requirements

  • Operating temperature: -20° to 45° C
  • Maximum operating altitute: 9,144 km

Syncing

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

  • Syncing range: 6 m
  • 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

Sensors and Components

  • 3-axis accelerometer
  • Altimeter
  • Vibration motor

Display

  • OLED display
  • Push the button to cycle through daily stats

Battery and Power

We recommend charging your One weekly to ensure you are always tracking.

  • Battery life: 10-14 days
  • Battery type: Lithium-polymer
  • Charge time: One to two hours
  • Radio transceiver: Bluetooth 4.0

Memory

  • Tracks 7 days of detailed motion data – minute by minute.
  • Tracks daily totals for past 23 days

What’s Included

  • Fitbit One™ tracker
    Charging cable
    Wireless sync dongle
  • Silicon clip
    Sleep wristband

Water Resistance

One is sweat, rain and splash proof. However, the device is not swim proof. With any clip-based wearable device, it’s best for your skin if the clip stays dry and clean.

Care

You can clip One to a belt, pocket or bra. Always use the silicone holder when clipping it to a bra or waistband as the plastic One tracker is not meant to be worn in direct contact with the skin. Make sure the One display faces outward when clipped to your bra. Learn more

Materials

The One tracker is made of thermoplastic. The clip is made of silicone and metal.

Environmental Requirements

  • Operating temperature: -20° to 45° C
  • Maximum operating altitute: 9,144 km

Syncing

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

  • Syncing range: 6 m
  • 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

Battery and Power

We recommend charging your One weekly to ensure you are always tracking.

  • Battery life: 10-14 days
  • Battery type: Lithium-polymer
  • Charge time: One to two hours
  • Radio transceiver: Bluetooth 4.0

Environmental Requirements

  • Operating temperature: -20° to 45° C
  • Maximum operating altitute: 9,144 km

Memory

  • Tracks 7 days of detailed motion data – minute by minute.
  • Tracks daily totals for past 23 days

Syncing

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

  • Syncing range: 6 m
  • 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

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*Your fully charged Fitbit One has a battery life of up to 14 days. Note that battery life and charge cycles vary with use, settings and many other factors; actual results will vary.