C

Pre-recorded compact discs (CDs), digital video discs (DVDs), multimedia software, downloadable audio and audio-visual files such as MP3, WMA, WAV, RM, WMV, and SWF files, and audio-visual instruments in the nature of miniature handheld and pocket-held devices providing audible and visual cues for the purpose of synchronizing the breathing for the purpose of achieving optimal autonomic nervous system balance