Headphones and earphones, radio headphones and radio earphones, loudspeakers, radio loudspeakers, cable telephone headsets, radio headsets in the nature of headphones, headphone-microphone combinations, microphones, amplifiers, radio transmission apparatus for audio signals, namely, radios; control apparatus, namely, remote controls, for loudspeakers, microphones and loudspeaker sets, in particular room sound systems, consisting of multiple loudspeakers dispersed around the room; computer plu...