1). MP3/WMA playback 2). High speed USB interface (USB 2.0) 3). Compatible with Windows 98/Me/2000/XP, Mac OS 4). Voice recording 5). Repeating function (repeat one, repeat all, normal, introduce) 6). ID3 tags, displays lyric, multiple languages 7). Key hold function 8). Supports Windows 98/2000/XP, no driver is required except for Windows 98 9). Accessories: USB cable, installation disk, headphone, user manual 10).Capacity: 128MB-1GB flash memory 11). Battery: 1 x AAA, lasts for 12 hours (alkaline battery) 12). Size: 88 x 33 x 21mm Inner packing: : 1pc/color box & Box dimensions: 165 x 115 x 45mm Outer packing: 50 boxes/ctn & Carton dimensions: 597 x 336 x 245mm G.W.: 15kg