A patient demonstrates the flexible, solar-powered fever alarm armband. It sounds an alarm when the patient's temperature reaches a predetermined mark.

Researchers at the University of Tokyo have developed a wearable device that can continuously monitor a patient’s temperature – and sound an alarm when a fever develops to alert a nurse or caretaker. Wireless and imperceptibly thin, the “fever alarm armband” is superior to a traditional thermometer in two ways: hygiene and patient comfort.