Stax Spirit S3 80 hours for music play and a short 10-minute charge giving 11 hours of playtime Hi-Res certified audio with cleaner sound, greater resolution, and better imaging, as same as true professional recording powered by a proprietary audio system Most advanced Microprocessing system, making telephone communication like face-to-face communication Enable a variety of advanced functionality-customized EQ settings, control settings, cushion sets, etc The lightest weighted over-ear planer headphones for all-day use, and an additional set cooling-mesh ear-cushion for on-the-go or traveling use