Specifications include, but are not limited to: For continuous monitoring of stress levels, participants will wear a E4 wristbands around their wrist. The E4 wristbands are equipped with the following sensors: PPG Sensor: Photoplethysmography (PPG) sensor records blood volume pulse, from which heart rate, heart rate variability, and other cardiovascular features may be derived. Variability in heart rate (the time between the peak of each heart beat) can occur from both sympathetic and parasympathetic activation. Estimates of sympathetic nervous system activation can be made by extracting certain frequency component of this heart rate variability. HRV is a sensitive and selective measure of mental stress ; We can observe increases in sympathetic activation by monitoring subtle electrical changes across the surface of the skin. 3-axis accelerometer, to capture motion-based activity. Infrared thermopile for reading skin temperature.