Feature: 1. IPX8 Water Resistant MP3 Player: The MP3 player is IPX8 water resistant, suitable for swimming. This swimming mp3 player has versatility beyond swimming and can be used with activities in which you might get wet. Running, surfing, skiing or kayaking comes to mind. 2. Music Player: Its sound format is MP3 and WMA and support MP3, WMA, APE, FLAC and other lossless format file playback. The water resistant MP3 player supports fast charging function, 8‑10 hours of play time. 3. Strong Compatibility: This water resistant MP3 player is compatible for Win 2000 for Win ME for Win XP for Vista and for OS X 8.6+ and for Linux 2.4.0. Let you enjoy music anywhere, anytime. 4. Good Performance: The non volatile solid state storage date is retained for at least 10 years. Compliant with high speed USB2.0 specifications. The 4PIN 3.5mm headphone jack and the USB interface are shared, long press the play button to switch the machine. 5. Portable MP3 Player: Download all your favorite music from your computer. Suitable for swimming, surfing, running and most activities, enjoys music while you exercise. It's great for swimmers to avoid boring while listening to music. Specification: Item Type: Swimming MP3 Player Material: ABS Lossless Format File Playback: MP3 WMA Built in Polymer Lithium Battery: 130mAh (Shipped with Built in Battery) Compatibility: for Win 2000, WE, XP, for Vista, for OS X 8.6+, for Linux 2.4.0. Package List: 1 x MP3 Player1 x Earphone1 x Instruction Manual4 x Earmuffs1 x USB Cable1 x Storage Bag1 x Cleaning Cloth