Activity tracker Display: Touchscreen; Greyscale OLED Material : comfortable silicone (similar to that used in many sport watches) and fastens with a plastic buckle and tang Battery type: Lithium-polymer Charge time (0-100%): Two hours, Up to 10 Days of Battery Radio transceiver: Bluetooth 4.2 Water resistant to 50 meters Fitur : 3-axis accelerometer, Optical heart rate monitor, Vibration motor, Active Zone Minutes, Heart Rate Zones, Sleep Stages, 20+ Exercise Modes + Smarttrackâ„¢, Reminders to Move, 10 Days of Battery, Cardio Fitness Level, Sleep Score, Notification, Menstrual Health Tracking, 24/7 Heart Rate, All-Day Activity, Swimproof + Swim Tracking, Real-time Pace & Distance, Guided Breathing Sessions, Fitbit Premium Only (1-Year Trial for New Premium Users), Advanced Insights, Video and Audio Workouts, Guided Programs, Mindfulness Tool, Sleep Tools, Games and Challenges
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