Features & detailsEarn Active Zone Minutes as you progress toward your weekly 150 minutes of heart-pumping activity and use 20 plus exercise modes to track goals like distance, calories burned and more.Operating temperature: 14° to 113°FTrack all-day activity: your steps, distance, hourly activity and calories burned.Maximum operating altitude: 28,000 ftUse 24x7 heart rate to track resting heart rate & better measure calorie burnEnjoy 10 days of battery life for daily progress without constant charging. Varies with use and other factors. Track your time in light, deep and REM sleep, then get a Sleep Score to better understand your sleep quality each night.Stay inspired from the shower to the pool with this swimproof tracker (water resistant to 50 meters) and motivated by connecting with friends, competing in challenges, earning badges and celebrating goal milestones