Early Prototype of HET Wristband (IMAGE) North Carolina State University Caption This is an early prototype of the wristband used in the Health and Environmental Tracker (HET), an integrated, wearable system that monitors a user's environment, heart rate and other physical attributes with the goal of predicting and preventing asthma attacks. Credit James Dieffenderfer Usage Restrictions Image credit must be given. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.