"portable audio and video players" . . "music player" . "MP4 players" . "Portable media player#MP4 player" . . . . "portable" . . . . . . . . "portable video players" . "MP3 and other portable digital players" . . "portable media players" . . . "PMP" . "personal audio device" . "Portable_media_player#MP4_player" . . . . . . . . . "portable multimedia centers" . . . "portable devices" . "Portable_media_player#The_Audible_Player" . . . . . . . . . . . . . "TV phone" . "digital music player" . . . "portable media device" . . . . . . "portable media" . . . "play music" . . "digital players" . . "portable media player" . . "Portable_media_player" . . . . "audio transport" . "MP3 players" . "portable music player" . "mp3 player" . . "DAP" . . "Portable media player" . . . . . "Portable media player" . "media players" . . . . "Media player" . "digital media player" . "portable digital audio playback devices" . . . . . . . . . "multimedia players" . . . . . . "MP3 phone" . "digital media players" . "portable digital media player" . "digital audio player" . . . "digital audio" . . . "video player" . . . . . . . . . . . . . . . . . "portable players" . . "MP3 player" . . . . . . . . "personal music players" . "media player" . . .