Sensors & Components

• Multi-path optical heart rate sensor

• Red and infrared sensors for oxygen saturation (SpO2) monitoring

• Altimeter

• 3-axis accelerometer

• Ambient light sensor

• NFC

• Built-in GPS + GLONASS

• Vibration motor

• Speaker (75dB SPL @10cm)

• Microphone

• WiFi (deactivated, cannot be turned on)

Battery & Power

• Battery life of 6+ days. Battery life and charge cycles vary with use, settings and other factors; actual results will vary. We recommend charging your tracker every few days to ensure you are always tracking.

• Battery type: Lithium-polymer

• Charge time (0-100%): Two hours

• Radio transceiver: Bluetooth® 5.0

Memory

• Saves 7 days of detailed motion data, minute by minute

• Saves daily totals for the last 30 days

• Stores heart rate data at one-second intervals during exercise tracking and at five-second intervals all other times

Water-Resistant

• Water resistant to 50m. After getting the band wet, we recommend drying the band because, as with any wearable device, it's best for your skin if the band is clean and dry. Learn more.

Heart Rate

• Like all heart rate tracking technologies, accuracy is affected by physiology, location of device and different movements.

Environmental Requirements

• Operating temperature: -10° to 45° C

Compatibility

• Google account will be required. See fitbit.com/devices.

• The Fitbit app is compatible with most popular phones. To set up and use your Fitbit products and services, you must install the Fitbit app on a compatible device running one of the following operating systems:

• Apple iOS 13.3 or higher.

Syncing

• Syncing range: Up to 9m

• Certain features like smartphone notifications may require Android 8+. Check your device compatibility.

• Syncing requires Bluetooth® LE, an internet connection and location permissions granted on the phone

Band Size

• Print this guide to find the right size for you. Both small and large sizes included in box.

• Small

• Fits wrist 129mm - 175mm in circumference

• Large

• Fits wrist 158mm - 209mm in circumference

Dimensions

• 40.5mm l x 40.5mm w x 11.2mm h