Redefine routine with Fitbit Charge 5 + Premium our most advanced fitness and health tracker with premium features which includes Builtin GPS, Stress Management, Sleep Tools, 24/7 Heart Rate, SpO2 More. It track SpO2the level of oxygen in your bloodplus heart rate variability, skin temperature variation and more. Take steps to improve your stress levels with an onwrist EDA sensor mindfulness session. The app detects electrodermal activitytiny changes in your skin's sweat level which may indicate your body's response to stress.Content and features may vary by language and are subject to change. See terms and conditions at fitbit.com.