Data and discretion, all in one.

One One

Wireless Activity + Sleep Tracker

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One powerful, insightful tracker.

All-Day Activity

A sidekick that’s ready for all-day action.

Fitbit One® monitors every move of your fitness journey, so you can dive deeper into the stats you earn along the way.

Fitbit One® monitors every move of your fitness journey, so you can dive deeper into the data you create with each step you take, floor you climb and calorie you burn.

Clock + Display

See every move on display.

The user-friendly display makes it easy to quickly check your stats and the time in stride.

Fitbit One’s user-friendly display makes it easy to quickly check your stats in stride and stay moving throughout the rest of the day.

Sleep + Alarms

It gets to work while you get some sleep.

Put your tracker inside the sleep wristband that’s included with Fitbit One to track your sleep quality at night, then set a silent alarm to wake more peacefully.

Use the sleep wristband that’s included with your tracker to track your sleep quality on a nightly basis. You can also set a silent alarm that gently vibrates, waking you up without disturbing your partner.

Long battery life + wireless syncing

Battery life that keeps up with you.

Fitbit One has a 14-day* battery life and automatically syncs to your computer and 200+ leading devices so you never miss a stat.

Fitbit One has a 14-day* battery life and automatically syncs to your computer and 200+ leading devices so you never miss a stat.

Discreet, versatile wear

Built to blend in with everyday life.

Fitbit One clips securely and discreetly onto your pocket, belt or bra—giving you the flexibility to keep your fitness journey private.

Fitbit One clips securely and discreetly onto your pocket, belt or bra—giving you the flexibility to wear it under wraps and keep your fitness journey private.

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 altitude: 9,144 m

Syncing

One syncs automatically and wirelessly to tablets, computers and 200+ 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 altitude: 9,144 m

Syncing

One syncs automatically and wirelessly to tablets, computers and 200+ 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 altitude: 9,144 m

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 200+ 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

*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.