1、The MP3 player meets the international IPx8 waterproof standard, suitable for swimming. 2、Its audio format is MP3 and WMA , compliant with high speed USB0 specifications. 3、This waterproof MP3 player is compatible for Win2000/WinME/WinXP/Vista and for OS X 8.6+ and for Linux0. 4、The non volatile solid state storage date is retained for at least 10 years, and support MP3, WMA, APE, FLAC and other lossless format file playback. 5、The waterproof MP3 player supports fast charging function, 8‑10 hours of play time. 6、4PIN 5mm earphone jack and USB interface share, long press the play button to switch the machine. 1 x MP31 x Headphone1 x Manual4 x Ear Cap1 x USB Cable1 x Storage Bag1 x Wipe Cloth Item Type: MP3 PlayerMaterial: ABSFM Radio: 87MHz-108MHzBuilt-in Polymer Lithium Battery: 130mAhPlaying Time: 8-10 HoursMemory Capacity: 4GB(Memory Card is Not Included)