Abstract: A system for communication between sensors in training equipment and electrodes for a defibrillator (AED) or a defibrillator-trainer (AED-T) provides for determining electrode positioning and providing feedback to the user. The training equipment is provided with a non-conductive chest skin, and the communication is wireless and bi-directional. The information from the manikin is generated by a microprocessor with a digital-analog converter. The information signal is transmitted to the sensors in the manikin by use of drivers, which sensors each constitute one half of a non-galvanic coupling, in which the chest skin separates the halves, and the other halves of the non-galvanic couplings are formed by electrodes that are attached to the chest skin, the non-galvanic coupling being in the form of capacitors or coils.