7-day battery life, water-resistant to 50m Compatible with iOS 15 or higher and Android OS 9.0 or higher MOVE MORE: On-device heart rate display via Bluetooth, built-in GPS, 40+ workout modes, daily readiness score, active zone minutes, 24/7 heart rate, all-day activity tracking, cardio fitness levels, automatic workout tracking, Workout intensity map and mobile reminders Comfortable connectivity day and night: Google Maps, Google Wallet, Youtube music control, call, SMS and smartphone app notifications, vibrant color touchscreen with customizable clock face, timer and stopwatch Sleep better: automatic sleep tracking, personalized sleep profile, daily detailed sleep score (premium version), smart wake-up vibration alarm clock, sleep mode Health by Fitbit: Daily stress management score, mindfulness classes, relaxing breathing classes, blood oxygen saturation (SpO2) monitoring, resting and high/low heart rate notifications, EKG and irregular heart rhythm notifications Includes 6-month Premium Membership for deeper insights and guidance, exclusive workouts, mindfulness classes, and more Included in the box: Fitbit Charge 6 tracker (includes small and large straps). Small wristband sizes are 140mm - 180mm, large wristband sizes are 180mm - 220mm. Also includes charger (compatible with Fitbit Charge 5, not compatible with other models)