UWaterG4 -Metallic Black- "The Smallest 100% Waterproof MP3" 100% Waterproof MP3 Player and Earphones Play Time: Continuous 6-8 HRS (MP3) Built-in high performance (1000+ cycles) Li-Ion Rechargeable Battery IPX8 Waterproof Certification (10Ft/3M) System Compliant: Win 7/XP/2000/Vista/MAC 9.0 & Higher