If you clearly read the packaging it states that sound quality will depend on the MP3 player you are using and I have a 6GB Philips MP3 player which uses Windows Media player to download songs and the sound was crisp and clear

And it fits to my mp3 and my husband's mp3 players as well

device is simply great, meaning it's v-e-r-y easy to use and ideal for casual (non-audiophile quality) listening