• All-Day Activity Tracking - Track steps, distance, calories burned, active minutes, hourly activity and stationary time
• All-Day Calorie Burn - Better understand how many calories you burn—all day and during workouts—to manage your weight and stay on track toward your goals

• Sleep Tracking - Understand your rest with automatic sleep tracking and silent alarms on your wrist, plus bedtime reminders and tips in the app
• Sleep Tracking with Light, Deep, REM - See your time spent in light, deep and REM sleep stages and get sleep insights to help you improve
• Sleep Score - Based on your heart rate, time asleep and restlessness, this personalized score helps you better understand your sleep quality each night.

• Breathing Rate - Automatically measure your breathing rate while you sleep to help you understand your wellness and learn if there are signs of significant changes. View your nightly average and trends over the past week in the Health Metrics dashboard.⧫⧫⧫

• Oxygen Saturation (SpO2)Monitoring - tracks SpO2—the level of oxygen in your blood—to help you learn when there may be an indication of important changes in your fitness and wellness. See your SpO2 nightly average and range on wrist with an SpO2 clock face, and view trends over the past week in the Fitbit app.***
• Skin Temperature Variation - Track your skin temperature each night to see how it varies from your personal baseline. View your nightly average and trends over the past week in the Health Metrics dashboard.
• 24/7 Heart Rate Tracking - Use 24/7 heart rate to better track calorie burn, see your resting heart rate trends and get real-time guidance to optimize your workouts.
• Heart Rate Zones - Use your personalized fat burn, cardio and peak heart rate zones to optimize your effort during workouts.
• Breathing Rate - Automatically measure your breathing rate while you sleep to help you understand your wellness and learn if there are signs of significant changes. View your nightly average and trends over the past week in the Health Metrics dashboard
• Guided Breathing Sessions - Find moments of calm throughout your day with personalized breathing sessions based on your heart rate.
• 24/7 Heart Rate Tracking - Use 24/7 heart rate to better track calorie burn, see your resting heart rate trends and get real-time guidance to optimize your workouts.

• Heart Rate Variability - Track heart rate variability (HRV)—the variation of time between each heartbeat— to see if your body is showing potential signs of stress, illness or fatigue. View your nightly average and trends over the past week in the Health Metrics dashboard.
• Cardio Fitness Score - Get a better understanding of your fitness level and see how you can improve over time with a personalized Cardio Fitness Score.

• Menstrual Health Tracking - Know your body better by using Charge 4 and the Fitbit app to log periods, record symptoms, track your ovulation and discover patterns in your cycle

Built-In GPS

• During outdoor runs, rides, hikes and more, use built-in GPS to see your pace and distance on the Charge 4, then see a map of your workout in the Fitbit app.

Floors Climbed

• Automatically track floors climbed whether you're taking the stairs or walking up an incline

Reminders to Move

• See how long you've been active throughout the day and get reminders to fit in a few extra steps when you've been sitting a bit too long

Workout Intensity Map—In App Only

• After outdoor exercise, check your workout intensity map in the Fitbit app to see your heart rate zones throughout your route and learn where you put in the most effort.

SmartTrack™ Automatic Exercise Recognition

• Automatically record select exercises like running, biking and more & see detailed workout information in the Fitbit app.

Active Zone Minutes

• Active Zone Minutes help you make every minute count during workouts by buzzing your wrist when you enter your personalized target heart rate zone.

20+ Goal-Based Exercise Modes + SmartTrack™

• Choose from up to 20+ exercise modes to get real-time stats during your workouts—or let SmartTrack™ automatically recognize and record your exercises.

Swimproof

• Charge 4 is water resistant to 50 meters, which means you’re free to track laps in the pool and wear it in the shower, at the beach and beyond.

Do Not Disturb Mode

• Use do not disturb mode when you want to mute call, text, calendar and app notifications during the day.

What's included:

Fitbit Charge 4

Classic wristbands (both small & large)

Charging cable

Battery & Power

Battery life up to 7 days, or up to 5 hours with continuous GPS use. Battery life and charge cycles vary with use, settings, and other factors; actual results will vary. We recommend charging every few days to ensure you’re always tracking.

• Battery type: Lithium-polymer
• Charge time (0-100%): Two hours
• Radio transceiver: Bluetooth 4.0

Care

Give your wrist a rest by taking the band off every now and then. If the band gets wet or you sweat in it, remove and completely dry the band before putting it back on

Environmental Requirements

• Operating temperature: -4° to 140° F
• Maximum operating altitude: 28,000 feet

Memory

• Saves 7 days of detailed motion and heart rate data, minute by minute
• Saves daily totals for past 30 days
• Measures heart rate data at 1-second intervals during exercise tracking and at 5-second intervals all other times

Sensors & Components

• 3-axis accelerometer
• Optical heart rate monitor
• GPS
• Vibration motor
• NFC
• Altimeter

Heart Rate

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

Fitbit Charge 4 Wrist Band Size

• Small - Fits wrist 5.5" - 7.1" in circumference
• Large - Fits wrist 7.1" - 8.7" in circumference