... computer speaker, speaker,mini computer speaker, usb computer speaker, 2.0 usb speaker, computer 2.0 speaker, ... Formats: MP3*With Micro SD and USB Disk slot, USB connect*Output: RMS 6W(3W+3W) ... SD or TF card into this hole.- USB: for USB Flash Drive.- LINI IN: for audio input of mobile ... phone, MP3, MP4, PC and other audio devices.- DC-5V: plug USB ...