... one TF card, it can play the same as MP3 player (TF card is not included)3. Built-in Li-ion ... . Audio Source: TF card,PC,MP3,MP4,MD,CD,DVD player, Mobile phone, etc 8. Switch available, volume adjustable9.100% perfect ... meas:12x11.2x7cmCarton meas:57x26.2x42.5cm50PCS/CTNG.W.: 25kg Mini portable vibration desk speaker,portable laptop mini speaker