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EDA Scan app detects electrodermal activity which may indicate your body's response to stress and a built-in skin temperature sensor logs yours each night so you can see when it varies. Assess your heart for atrial fibrillation a heart rhythm irregularity- and easily share results with your doctor The Fitbit ECG app is only available in select countries. Not intended for use by people under 22 years old.Operating temperature 14 to 113F. An on-wrist skin temperature sensor tracks yours each night so you can see how it varies. You can also see your nightly blood oxygen levels at a glance with our collection of clock faces.Radio transceiver Bluetooth 5.0.Operating temperature -10 to 45 C. High low heart rate notifications alert you if yours seems above or below your average.Battery lasts 6 plus days plus, fast charging gives you a full day's charge in just 12 minutes Varies with use and other factors up to 12 hours with continuous GPS.Use built-in GPS during runs, hikes, rides and more to see pace distance without your phone and use the built-in mic and speaker to take Bluetooth calls hands-free when your phone is nearby Requires more frequent charging..