Allnice&reg; Black 4GB Waterproof Swimming Surfing SPA Diving Sports IPX8 Headphone Headset Earphone MP3 Player with FM Radio Stand alone solution for MP3 Player and Waterproof function. Smart design, No need for a strap, band or cases. no need extra cable or headphone lines. Easy and comfortable to wear. Support mp3, WMA, VBR format music, Easy to connect to PC/MAC to download music. 4GB memory inside. IPX8 for 3 meters under water. Rechargeable battery last over 10 hours continuous play, Built in Li-ion rechargeable battery.