OTIS (Oxygen and Temperature System) is a wireless Oximeter with a temperature probe, used in HELMiS vital signs architecture, designed and produced by Microsensor. The data provided by its measurements are the percentage of oxygen saturation in the blood (SpO2), Heart rate (bpm) and body temperature (°C or °F) on the skin. These values ??are processed by the meter and sent (via radio signal in 2.4 GHz ISM band) to a server for data storage and handling.