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Up to 7-Day Battery Life Track activity, sleep, heart rate and more with multi-day battery so you can do more on a single charge.
Secure Tap to Pay Make purchases from Charge 4 at millions of stores or transit stations—no phone or wallet necessary.
Oxygen Saturation (SpO2) Track 5p02 to help you learn when there may be an indication of important changes to your fitness & wellness...
Alerts When You Decide Use do not disturb or sleep mode to mute calls & set a vibrating alarm for reminders or to wake peacefully.
Health Metrics Track breathing rate, heart rate variability, skin temperature and more for your well-being in the Fitbit app....
20+ Goal-Based Exercises Go into exercise modes during your favorite workouts. then set a goal and get real-time stets as you move.
All-Day Activity Track steps. distance, floors. Active Zone Minutes and calories burned to see how you impact your goals.
Smart Features Get call. text. calendar and app notifications when your phone is nearby & send quick text replies on Android.
Menstrual Health Tracking Use Charge 4 with the Fitbit app to follow your cycle, record symptoms and more.
Find moments of calm throughout the day with personalized breathing sessions based on your heart rate.
Sensors & Components
Optical heart rate monitor
GPS + GLONASS
Red and infrared sensors for oxygen saturation (SpO2) monitoring
Device temperature sensor (skin temperature variation available in the Fitbit app)
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
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
Water Resistance Water resistant to 50 meters. After swimming or 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. We do not recommend wearing Fitbit Charge 4™ in a hot tub or sauna. Learn more.
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. Learn more.
This tracker includes a plastic resin case and the band includes a stainless-steel buckle. The classic band is made of a flexible, durable material similar to that used in many sports watches. The woven band is made from a comfortable polyester.
Heart Rate Like all heart rate tracking technologies, accuracy is affected by physiology, location of device and different movements.
Operating temperature: -4° to 140° F
Maximum operating altitude: 28,000 feet
Syncs automatically and wirelessly to most popular phones and tablets using Bluetooth LE wireless technology.
Syncing range: Up to 30 feet
Certain features like smartphone notifications may require Android 7.0+. Check your device compatibility.
Syncing to mobile devices requires Bluetooth LE and internet connection.
Syncs with Mac OS X 12.2 and up, iPhone 5S and later, iPad 5 gen. and later, Android 7.0 and later.
Music control via Bluetooth LE on Android and iOS devices.
Print this guide to find the right size for you. Both small and large sizes included in box.
Fits wrist 5.5" - 7.1" in circumference
Fits wrist 7.1" - 8.7" in circumference