Model: FB421BKBK
Meet the most advanced fitness & health tracker with tools like an on-wrist ECG app for heart health,** EDA Scan app for stress management and more. Get a 6-month membership of Fitbit Premium™*** and optimize your routine with Daily Readiness Score.
Product Details:
Health
Fitbit ECG (Electrocardiogram) App
EDA (Electrodermal Activity) Scan App
Stress Management Score
Reflections
Oxygen Saturation (SpO2) Monitoring
Heart Rate Variability
Breathing Rate
Skin Temperature Tracking
Sleep Score & Sleep Stages
Menstrual Cycle Tracking
Health & Wellness Reminders
Fitness
Daily Readiness Score
Active Zone Minutes
24/7 Heart Rate Tracking with PurePulse
Built-In GPS
SmartTrack
Workout Intensity Map
20 Exercise Modes
All-Day Activity Tracking
Cardio Fitness Level
Swimproof
Smart
Notifications
Google Fast Pair
Sleep Mode
Smart Wake
Do Not Disturb Mode
Up to 7-Day Battery Life
Fitbit Pay
Deisgn & More
Vibrant Color Display
Always-On Display Mode
Infinity Bands
Accessories
Specifications:
Sensors & Components
Optical heart rate monitor3-axis accelerometer
Built-in GPS + GLONASS
Red and infrared sensors for oxygen saturation (SpO2) monitoring
Device temperature sensor (skin temperature variation available in the Fitbit app)
Vibration motor
Ambient light sensor
Radio transceiver: Bluetooth
NFC
Multipurpose electrical sensors compatible with ECG app & EDA Scan app
Battery & Power
Battery life of up to 7 days. Use of the always-on display and SpO2 features will require more frequent charging. We recommend charging your tracker every few days to ensure you are always tracking.
Battery type: Lithium-polymer
Charge time (0-100%): Two hours
Memory
Saves 7 days of detailed motion data, minute by minute
Saves daily totals for the last 30 days
Stores 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 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.
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.
Learn more.
Materials
The Charge 5 housing is made of aluminum, glass and resin. The band is made of silicone and has an aluminum buckle.
Heart Rate
Like all heart rate tracking technologies, accuracy is affected by physiology, location of device and different movements.
Environmental Requirements
Operating temperature: 14° to 113°F
Maximum operating altitude: 28,000ft
Syncing
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 12.2 or higher.
Android OS 8.0 or higher. See additional tips for Android phones
here.
Syncing range: Up to 30ft
Certain features like smartphone notifications may require Android 8.0+.
Check your device compatibility.
Syncing requires Bluetooth LE and internet connection.
Syncs with Mac OS X 12.2 and up, iPhone 5S and later, Android 8.0 and later.
Band Size
Print
this guide to find the right size for you. Both small and large sizes included in box.
Small: Fits wrist 5.1" - 6.7" in circumference
Large: Fits wrist 6.7" - 8.3" in circumference
Window Size
Viewing area: 1.04" diagonal
Screen height: 0.86"
Screen width 0.58"
What's included:
Fitbit Charge 5
Infinity band (small & large)
Charging cable
Lithium Battery Shipping Restrictions: Due to federal regulations governing the transportation of lithium batteries, we are unable to ship this item to Puerto Rico or via air freight. Lithium batteries are classified as hazardous materials, and their shipment is subject to strict regulations, including restrictions on air transport. We apologize for any inconvenience this may cause and appreciate your understanding and compliance with these safety requirements.
