Television and radio receivers, multimedia terminals, hi-fi systems, apparatus for recording, transmission or reproduction of sound and images, cd players, audio amplifiers, active loudspeakers, broadcast transmission devices, data processing apparatus, computers, namely personal and home computers, telephone apparatus (with a card or mobile), visual display screen telephones, monitors and data display devices, computer programs recorded on data carriers, memories for magnetic disks, optoelectronic disks recording and reproduction devices; remote control devices for the aforesaid products