Researchers at the University of Tokyo have developed a flexible fever alarm armband that incorporates organic components. The armband contains a temperature sensor, flexible solar panel, piezoelectric speaker, and power supply circuit. It sounds an alarm if it detects a rise in body temperature for continuous monitoring of vital signs like temperature and heart rate, especially useful for infant, elderly, and patient care. The organic materials allow the device to be flexible, wireless, disposable, and produced inexpensively using inkjet printing.