1,WMA/MP3 format 2,Build-in li-bettery Discription: Model Number:MP-247B 1.MP3 and WMA playback2.MP3 player without LCD 3.Alloy case with multiple color choices, USB2.0 High-speed 4.Drop playback, timing turn off 5.Accessories: manual, CD driver, USB line and earphone 6.Run on 1 x AAA cell,7.32MB to 4GB flash memory support