 The HeartBeat system combines an FDACE approved watch-like Pulse Oximeter for acquiring the data and an android software application that serves as the Hemodynamic calculator. The application performs POST-PROCESSING of the PhotoPlethismoGraphic PPG signal Normally the PPG signal in Pulse Oximeters is used only to compute heart rate and SpO2. The raw data is transferred from the watch oximeter to the smartphone using a standard Bluetooth protocol. 