1) Plug-and-play MP3 player  2) Music format: MP3 or WMA  3) build in LI- battery, can play more than 5 ~ 12 hours  4) Storage capacity: 128MB~8GB bytes  5) Outputs power: 5mW  6) Two earphones: 5mW  7) Supported OS: Windows 98/Me/2000/XP/Mac OS 9.X/Linux 2.4 8)Colors available: gree,blue,silver,black