Cameras; Earphones; Loudspeakers; Microphones; Radios; Acoustic amplifiers; Acoustic conduits; Computer peripheral devices; Ear plugs for divers; Electronic sound pickup for guitars and basses; Guitar amplifiers; Karaoke machines; Notebook computers; Radio transmitters and receivers; Sound recording apparatus; Soundbar speakers; Video disk players; Wireless speakers; Wireless transceiver radio; Wireless transmitters and receivers; MP3 players