Fitbit Debuts Sense, its Most Advanced Health Smartwatch; World’s first with EDA Sensor for Stress Management, Plus ECG App, SpO2 and Skin Temperature Sensors. Fitbit also launches Versa 3, adding GPS and a speaker; brings enhanced design and Active Zone Minutes (AZM) to Inspire 2. New Health Metrics dashboard for Premium lets users track heart rate variability, breathing rate, skin temperature variation and more.