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)
Device temperature sensor (skin temperature variation available in the Fitbit app)
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.
Materials
This watch includes a band made of a flexible material similar to that used in many sports watches, as well as an aluminium watch case and buckle.
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. 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 15 or higher.
Android OS 10 or higher.
Syncing
Syncing range: Up to 9m
Certain features like smartphone notifications may require Android 10+.
Syncing requires Bluetooth® LE, an internet connection and location permissions granted on the phone
