The Cardio Theater systems are audiovisual entertainment systems for cardiovascular exercise machines. They allow the user of the machine to enjoy different audiovisual contents (television, radio, CD, etc.) while practicing exercise on their device. Each of these components is connected to a wireless transmitter (at a maximum number recommended on each product) and on each cardiovascular machine a receiver control is installed with channel and volume controls to choose the component that you want to listen to and adjust its volume level. The power connection is made with a discrete cable of a few centimeters if the machine is compatible with the CSAFE (Communications Specification for Fitness Equipment) standard, which basically consists of an RJ45 socket on the rear panel of the machine that offers a voltage of 9 Vdc power supply so that the receiver can operate. The headphone jack, which is the piece that suffers in this type of system, in all brands is a piece of rapid replacement without even having to dismantle the control of the machine.