... portable Mini speaker for Iphone, computer,CD, MP3 & Mp4 mini speaker, computer speaker, speaker,mini computer speaker, usb computer speaker, 2.0 usb speaker, computer 2.0 speaker, notebook speaker, portable speaker, promotional speaker ... TF card into this hole.- USB: for USB Flash Drive.- LINI IN: for audio input of mobile phone, MP3, MP4, PC and other ...