Amplifiers, battery chargers, electric batteries, compact disc players, audio players, audio recorders, computer peripheral devices, connectors, ear plugs, headphones, jukeboxes (musical), jukeboxes (video) loudspeakers, monitors (computer hardware), optical discs (audio and video), projection screens, remote control apparatus, audio receivers, radios, personal stereos, sound transmission apparatus, stereo televisions, transmitters of electronic signals, video players, video recorders, video receivers