1,Necklace MP3 Music Player 2,color prin ad/logo/photo on the two sides ... .0 high speed 4,Rechargeable Li-ion Battery Necklace MP3 Music Player Necklace MP3 Player,Supports MP3/WMA formatUSB 2.0 high speed, No display ... USB port Function CharacteristicsUSB InterfaceUSB2.0 high speedCapacity128M,256M,512M,1GB,2GB,4GB,16GB(Optional)Storage DeviceRemovable Storage DeviceCard TypeN/AA ...