Fitbit Alta HR Heart Rate and Fitness Wristband Black X-Large Discontinued Discontinued Key Specifications PurePulse Heart RateCardio Fitness LevelOLED Tap DisplayUp to 7-Day Battery LifeSmartTrack Auto Exercise Recognition SKU:#034216 Product No.:FB408SBKXL Short link:http://i.nvade.it/8TS See specifications from the manufacturer Description Specifications When it comes to health, heart matters. Heart rate is a powerful tool that can help you reach your goals faster. PurePulse tracks it continuously on your wrist, without a chest strap. Better calorie burn tracking By measuring your heart rate all day and during workouts, you get a more accurate measure of your calorie burn. Make the most of each workout Use heart rate zones to see how hard you’re working during exercise and dial your effort up or down. Gain insight into your health See how working out more can impact your resting heart rate, a key indicator of cardiovascular health. From walks to workouts, track it all. Steps, Calories & Distance Track your all-day activity, and tap the OLED display to see how close you are to your daily goal. SmartTrack™ Auto Exercise Recognition Alta HR auto-detects workouts like running, elliptical, biking and more, and logs them to your dashboard. Battery Up to 7 Days A single charge gives you up to 7 days of battery life—so you can plug in less, and move more. Get a better night’s sleep. Auto Sleep Tracking & Alarms Automatically track your sleep duration and consistency. Then wake up peacefully with a silent alarm. Sleep Stages Using heart rate, Alta HR shows your time in light, deep and REM sleep to help you understand your sleep quality.