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We gather data from the best available sources, including vendor and retailer listings as well as other relevant and independent reviews sites. Battery life varies with use and other factors.ZDNET's recommendations are based on many hours of testing, research, and comparison shopping.Battery life of up to 5-plus days so you can wear it all day and night without charging.Know your exercise stats in real time and check the time, even when your hands are full.Everything you want to see is a quick glance away.Track your laps, duration, calories burned and more during swim workouts.See the quality of each night's sleep by measuring heart rate, time asleep, time awake, time in deep and REM sleep and restlessness.Notifications work when phone is nearby.Get call and text notifications, store and play music, use apps like Uber, United and Strava, and make secure purchases - all from your watch.Amazon Alexa not available in all countries, see /voice.Get quick answers, check the weather, set timers, reminders and more with Amazon Alexa built-in voice control.Receive friendly reminders to reach mini activity goals.Track steps, heart rate, distance, calories burned, floors climbed, active minutes, hourly activity and stationary time.Understand your body better with advanced features such as Sleep Score, 24/7 heart rate, female health tracking and on-screen workouts.

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