CityU smart mask illustration (IMAGE) City University of Hong Kong Caption Illustration of the overall concept of the smart mask, which integrates an ultra-thin nanocomposite soundwave sensor to detect various respiratory sounds of breathing, coughing and speaking. Credit City University of Hong Kong Usage Restrictions Image must be used with appropriate caption and credit License Original 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.