A small unit dedicated to the measurement and displays of several physiological parameters, e.g., electrical activity of the heart, respiratory rate, temperature, blood pressure, pulse, and oximetry. The signals are obtained through connected cables/leads/probes. It is designed to operate as part of a patient monitoring system enhancing the function of this system (the parent device). The module automatically plugs into the parent device when the user places it into a standardized slot in the parent device which then operates as a mainframe computer displaying the various parameters/information measured and provided by this module.