- With up to 50-hour battery life and quick charging, you’ll have enough power for multi-day road trips and long festival weekends.1 - Great sound quality customizable to your music preference with EQ Custom on the Sony | Headphones Connect App.3 - Boost the quality of compressed music files and enjoy streaming music with high quality sound through DSEE™. BRAND NEW! This box has been opened, but the headphones have never once been used.