A wearable, battery-powered, electronic device intended to continuously measure body temperature and wirelessly transmit data to a computing device, typically a smartphone or tablet with dedicated software, for recording and data display; it is typically used to monitor temperature during daily activities and sleep. It is in the form of an adhesive patch designed to be placed on the skin (typically in/near the armpit); a charging case and software may be included. This is a reusable device.