... Mp3, WMA Format; 3.No Sreen; 4.Build-in Rechargable Battery; 5.Sport Design Sport Mp3 Player JX-129 Back-hang ... power off Main colour: Blue /Black /Red. Specs:Battarry: 150mAH rechargeable Li-on battery. Play time: 5 hours. Support MP3, WMA, MemoryUp to ... (W)*50(L)mm Accessories: Packing box, earphones, USB cable, charger, manual.