Devices and systems for continuous monitoring of the heart rate of a patient diagnosed with or at risk of heart diseases. The first cable may have a right hand threads on its core, while the second cable may have left hand threads along its core. The mechanical-coupling means further comprise at least one first element made of insulating material having a shaped body, on which there are defined housing seats, designed to couple each with corresponding busbars insulating them from one another. As a result, the present invention provides the ability to eliminate conventional hardcopy reports typically produced in the form of a billing statement. Upon stop event detection, each stop device records its local timer value and subsequently transmits that value to a collection device or console. As the voice storage device receives the incoming signal, the port control unit detects the port, which is available.