A cordless, wireless system for providing the long-term collection of medical data that may be used in digital ECG analysis, that includes a retaining element that retains a sensor in close proximity or adjacent to a user's skin and an intelligent measuring head that obtains the information provided by the sensor and transmits the obtained information to a processing system. The processing system collates the obtained information and determines from the collated data a digital ECG response and further a blood pressure based on blood oxygenation level.