Move more: Heart Rate on Equipment via Bluetooth, 40+ Exercise Modes, Built-in GPS, Active Zone Minutes, Daily Readiness Score, 24/7 Heart Rate, All-day Activity Tracking, Cardio Fitness Level, Automatic Exercise Tracking, Workout Intensity Map and Reminders to Move Comfortably Connected: Youtube Music Controls, Google Maps, Google Wallet, Call, Text and Smartphone App Notifications, Vibrant Colour Touchscreen with Customizable Clock Faces, Timer and Stopwatch Health: our most accurate heart rate yet, ECG and irregular Heart Rhythm Notifications, Oxygen saturation (SpO2) Monitoring, Resting Heart Rate and High/Low Heart Rate Notifications 6 days of battery and Water-resistant up to 50m Stress Management Score, Nightly Sleep Score, On-wrist mindfulness session, Smart Wake alarm, Sleep and Do not disturb modes Includes 6-month Premium membership for deeper insights & guidance, exclusive workouts, mindfulness sessions and more Included in box: Fitbit Charge 6 Tracker (Size Small and Large Straps included). Wrist straps measure small 140 mm–180 mm with additional Large 180 mm–220 mm. Charger also included (Compatible with Fitbit Charge 5, not compatible with other models) Compatible with iOS 15 or higher & Android OS 9.0 or higher