Specifications for MP3 players: Music Form:Music(MP3/WMA) playingVoice Effect Mode:Jazz/Classic/Rock/POP/NormalPlaying Mode: various cycle mode,special Preview ModeLCD Faceplate:96*26pixel,Blue Light Backgrand Memory Size:64M/128M/256MEarphone:Particular necklace-style design SNR:90DBEarphone Output Power:5MW+5MWOutput Frequency:20HZ-20KHZVoice Sampling Frequency 8KHZCompress Rate:32KBPS-256KBPSWeight:32g(without battery)Operating Sys: Windows98/Me/2000/XP