Sony NWE395/R 16GB Walkman MP3 Player (Red) Digital music & photo player with FM radio, Drag & drop from iTunes (PC) or Windows Media Player, Rechargeable battery with up to 35 hours audio playback Alarm and timer function, Playlists compatible, Earbud style Headphones and USB cable included System requirements: Mac OS X (v10.6 or later), Microsoft Windows 8, Windows Vista (SP2 or later), Windows 10, Windows 7 (SP1 or later), Windows 8.1. Actual battery life will vary based on product settings, usage patterns and environmental conditions. 1 GB equals 1 billion bytes, a portion of which is used for data management functions.