From Fitbit, the Alta HRTM fitness wristband features:comfortable band with secure buckle closurePurePulse continuous wrist-based heart rate to better track calorie burn, gauge workout intensity and get a picture of your overall health without an uncomfortable chest straptrack your resting heart rate: wear day and night and see if your resting heart rate improves over time, which can be a key indicator of cardiovascular healthauto sleep tracking with sleep stages: automatically tracks how long you sleep; shows your time spent in light, deep, and REM sleep; and has a silent vibrating alarm to help you wake more peacefullyall-day activity tracking: tracks activity like steps, distance, calories burned and active minutes and displays your stats to help you stay motivated to move morefriendly Reminders to Move to encourage you to stay activeSmartTrackTM auto exercise recognition automatically detects and logs workouts to the Fitbit dashboard so you get credit without ever pushing a buttonsmartphone notifications: call, text and calendar notifications on display so you never miss the messages that matterclear, bright OLED tap display, with customizable clock face, for instant access to stats, time and notificationswireless sync: syncs wirelessly and automatically to computers and 200+ leading iOS, AndroidTM and Windows smartphones so you can access your stats anytime, anywhereapp and dashboard: use the Fitbit app to set goals, track your progress, connect with friends share your milestones, get personalized fitness coaching and moreworks with Aria Wi-Fi Smart Scale (sold separately)interchangeable bands (sold separately) so you can tailor your look, no matter what the occasionwater resistantbattery life: up to 5 dayssize S fits wrists 5.5-6.7" in circ


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