Early Prototype of HET Wristband (image) North Carolina State University Share Print E-Mail 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. Share Print E-Mail 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.