Lonve Waterproof Headphones MP3 4GB Player Sport Splash FM Radio-Black Supported format:MP3(8 to 320kbps), WMA.VBR,AAC files Power: the built-in 3.7V lithium polymer, rechargeable battery Up to 12 hours of playback time 87.5-108.5MHZ frequency range(Self selection) System is to support Windows ME/2000XP/Vista,PC interface: USB2.0