[ Ear plugs for divers; ] Earphones; [ Electrical pickups for use with musical instruments; Electronic communications systems comprised of computer hardware and recorded software for the transmission of data between two points; ] Headphones; Headsets for telephones; Headsets for use with computers [ ; Horns for loudspeakers; Megaphones; Microphones; Personal stereos; Portable and handheld digital electronic devices for recording, organizing, transmitting, manipulating, and reviewing text, dat...