Specifications for MP3 players: Music Form: Music (MP3/WMA) playing Voice Effect Mode: Jazz / Classic / Rock / POP / Normal Playing Mode: various cycle mode, special Preview Mode LCD Faceplate: 96*26 pixel, Blue Light Backgrand  Memory Size: 64M / 128M / 256M Earphone: Particular necklace-style design  SNR: 90DB Earphone Output Power: 5MW 5MW Output Frequency: 20HZ-20KHZ Voice Sampling Frequency: 8KHZ Compress Rate: 32 KBPS - 256 KBPS Weight: 32g (without battery) Operating Sys: Windows98 / Me / 2000 / XP