Fitbit Sense Advanced Smartwatch is a popular health-tracking fitness watch with some basic fitness features and an additional EDA sensor available from Fitbit. It's the world's first smartwatch with an EDA sensor for stress monitoring. EDA stands for Activity Response, which uses multi-path electrical sensors to measure the body's stress responses. When you wear the Fitbit Sense smartwatch on your wrist, it measures the EDA sensor. This aids the device's Stress Management feature. Take a look at our Fitbit Sense review.