Wearable device for vocal fatigue (IMAGE) Northwestern University Caption Developed by biomedical engineers and opera singers, the small, soft, flexible, wireless device sits on upper chest to monitor vocal activity in real time. When the user nears their vocal budget, an accompanying haptic device (located on the risk) vibrates an alert. Credit Northwestern University Usage Restrictions add 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.