Fitbit Alta HR: Key Features Call, Text & Calendar Alerts Battery Up to 7 Days Track your all-day activity Reminders to Move Customizable Clock Faces Everyones path to health and fitness is different-jumpstart yours with Fitbit Alta HR. Get the power of PurePulse heart rate in a slim, stylish wristband so you can better track calorie burn, gauge your exercise intensity, and see your resting heart rate trends. Track all the basics like steps, distance and calories burned, and get friendly Reminders to Move that motivate you to keep stepping. And keep track of your workouts with SmartTrack automatic exercise recognition, which gives you credit for being active. Smartphone notifications keep you connected to your day, and you can tailor your look for any occasion with interchangeable metal, leather and classic bands. By night, Alta HR automatically tracks your sleep and shows your time spent in light, deep and REM sleep.