With GPS. Pick up only!!! EDA Scan App The on-wrist EDA Scan app detects electrodermal activity--which may indicate your body's response to stress so you can better track and manage it. ECG App With a compatible ECG app right on your wrist, assess your heart for atrial fibrillation--a heart rhythm irregularity--and share the results with your doctor.* On-wrist Skin Temperature Sensor Sense logs your skin temperature each night to show how it varies from your personal baseline, so you can be aware of trends over time. Free Premium Trial Your Sense smartwatch unlocks a free 6-month trial for new Fitbit Premium members complete with personalized insights, advanced analytics, guided programs, mindfulness & sleep tools, workouts and more.** High & Low Heart Rate Notifications Your heart rate is a key indicator of health, so stay informed when Sense detects that your heart rate is unusally high or low.