Features and specifications: 1) Plug-and-play MP3 player 2) Music format: MP3 or WMA 3) 1pc AAA battery, can play more than 6 ~ 12 hours 4) Storage capacity: 32MB~2GB bytes 5) Outputs power: 5mW 6) Two earphones: 5mW 7) Supported OS: Windows 98/Me/2000/XP/Mac OS 9.X/Linux 2.4 Size and weight Height: 1.07 inches Width: 1.62 inches Depth: 0.41 inch (including clip) Weight: 0.55 ounce Crystal case packing