Fitbit FB523BKBK-US Versa 4 Fitness Activity Tracker Watch Black/Graphite Aluminium

Fitbit FB523BKBK-US Versa 4 Fitness Activity Tracker Watch Black/Graphite Aluminium

Heart rate tracking

The heart of it all—heart rate powers important data like calorie burn, sleep stages, resting heart rate & more.

Active Zone Minutes

Tracks your time in heart rate zones so you get credit when you work harder. Workouts in cardio or peak zones earn double minutes.

Built-in GPS

See pace & distance on your wrist—no phone needed

Cardio Fitness Score

Estimate your fitness level using your VO2 Max (how well your body uses oxygen during exercise).

Daily Readiness Score

Find out if your body’s ready to work out or needs time to recover. Available with Premium.

Automatic exercise tracking

Auto-detects when you’re exercising and records your stats in the app.

Exercise modes

Track your favorite exercises like runs, bike rides, weights, yoga & more and get live stats on your wrist.

Water resistant

Water resistant to 50m for the pool, shower & more.

Workouts on your phone

Sweat to high-energy workouts in the Fitbit app, from Fitbit trainers & popular partner brands. Most workouts require a Premium membership.

Steps, distance & calories

Displays stats on wrist and in the Fitbit app.

SpO2 (blood oxygen) tracking

Tracking SpO2 tells you how well blood oxygen is distributed in your body, which can help you understand potential changes in your wellness.

Resting heart rate

An important indicator of your heart health & fitness. In general, active people have a lower RHR.

High & low heart rate notifications

If resting heart rate is above or below your usual range, you get notified in the Fitbit app.

Heart rate variability

Tracks HRV–your time between heartbeats. A downward trend over multiple nights could potentially be a result of overtraining, lack of sleep, stress and more.

Skin temperature variation

Identifies changes in skin temperature, which can be related to activity, illness, menstrual cycle & more.

Breathing rate

Small variations in your breathing rate could be a sign of changes in your well-being.

Wellness report

Get a PDF of your key health & wellness stats from the last few months that you can share with a healthcare professional. Available with Premium.

Blood glucose tracking (in app only)

Log your glucose levels and see how activity, sleep, stress & nutrition impact your trends in the Fitbit app. Advanced analytics available with Premium.

Menstrual health tracking

Log periods, record symptoms, find patterns in your cycle & estimate your ovulation window.

Sleep tracking & sleep stages

Automatically tracks how long you sleep each night and time spent in light, deep and REM sleep stages.

Sleep Profile

Get matched with a sleep animal and see a personalized analysis of your sleep every month. Requires Fitbit Premium membership. Not intended for medical purposes. Consult your healthcare professional for questions about your health.

Sleep Score

Learn about the quality of your previous night’s sleep with a personalized Sleep Score.

Smart Wake alarm

Vibrating alarm wakes you during the optimal sleep stage so you feel refreshed.

Stress Management Score

See how well your body’s handling stress each day. Detailed score breakdown available with Premium.

Mindfulness sessions

Access tracks for meditation, yoga, relaxation, sleep & more. Most sessions require a Premium membership

Relax breathing sessions

Do simple guided breathing sessions by following prompts on your wrist.

Reflections

Log your mood and get in tune with your emotional stress.

On-wrist Bluetooth calls

Answer calls on your wrist, send callers to voicemail and adjust volume (when your phone is nearby)

Call, text and app notifications

See calls, texts & smartphone app notifications on your wrist when your phone is nearby.

Alexa Built-in

Use Alexa Built-in to get quick news and weather, set alarms, control your smart home devices and more.

Google Maps

Easily get where you’re going with an interactive view and turn-by-turn directions on your wrist.

Google Wallet

Make purchases from your wrist with Google Wallet everywhere Google Pay is accepted. Coming soon.

Fitbit Pay

Make purchases from your wrist with Fitbit Pay

Find My Phone

Find your phone without making someone call it for you.

Always-on display mode

Keeps your display on at all times (may require more frequent charging).

Do not disturb & sleep mode

Mutes calls & notifications and turns your screen off.

Fast charging

Get a day’s worth of battery in just 12 minutes. Battery life varies with use & other factors.

6+ day battery

Long battery life means less charging, more living. Battery life varies with use & other factors.

Thin, lightweight design

Stay comfortable all day, during workouts, sleep and more with a design that fits more naturally on the wrist.

Color touchscreen

A bright color display for sharp stats all day.

Clock faces & accessories

Give your Fitbit a stylish new look with dozens of clock faces and accessory bands to choose from.

Compatible with iOS and Android devices

Fitbit devices are compatible with iOS and Android phones.