Key Features . Built-in GPSTrack your steps monitor your heart rate and more!Compatible with Android and iOS SmartphonesWater resistant to 50 metresLessen your stressThe on-wrist EDA Scan app detects electrodermal activity which may indicate your body’s response to stress. You can use the Fitbit app to track trends over time reflect on your mood and try new mindfulness tools. Understanding stress is clearer with your daily Stress Management Score which comes with a helpful breakdown for Premium members. For the muscle that moves youUse the on-wrist ECG app to assess your heart for atrial fibrillation (AFib) a common heart rhythm irregularity. Plus stay informed with heart rate notifications when Sense detects that your heart rate is above or below your threshold Take health to the next degreeSkin temperature tells a story about your body. Sense has an on-wrist skin temperature sensor to track your variation each night and show if it varies from your usual range so you can identify changes in your trends over time. A new way to see wellnessTrack SpO2 the level of oxygen in your blood to help you learn when there may be an indication of important changes in your well-being. See your SpO2 nightly average and range on wrist with an SpO2 clock face and view trends over the past week in the Fitbit app Boost your energy with better restTrack your time in light deep and REM sleep then get a Sleep Score to better understand your ZZZs. And use the Smart Wake alarm to wake up during the optimal stage of sleep and be ready to take on your day. Dive inSense is water resistant to 50 meters which means you’re free to track laps in the pool and wear it in the shower at the beach and beyond however please don’t take it into the sauna or soak in the bath with it on..