Waterproof MP3 Player Memory size:128/256/512/1024MB Audio format: MP3, WMA Compliant to USB 2.0 specification(full speed ) Equalizer: Normal, Jazz, Pop, Classic,Rock No external power is required, power by USB bus,Hot Plug & play Non-volatile solid-state storage - data retention for at least 10 years Endurance : 100K Program/Erase cycles Mass storage compliant (No driver needed for Win2000/WinME/WinXP and Mac OS 8.6 or above and Linux 2.4.0)