LONG 14 DAY BATTERY: Enjoy extra-long battery and charged up for two weeks of activity with typical use. STRONG GPS: Highly accurate 4 GPS system data keeps location precise using GPS, GLONASS, GALILEO, and QZSS location data. EASILY COUNT STEPS AND DISTACE: Hit your daily step count goal everyday with at a glance monitoring, and track total distance each day, week, or month. HEART RATE AND BLOOD OXYGEN MONITOR: Quickly see how hard you're working with heart rate and blood-oxygen tracking, and even stress monitoring. SLEEP QUALITY DATA: Learn when you get your best sleep recovery with sleep tracking of REM, deep sleep, light sleep, even daytime nap duration.