... .Universal 3.5mm audio interface. 3.Support for multimedia players.4.USB power,perfect for laptop. Selling point1.Crystal-clear sound effects ... and concise design,graceful appearance and smooth lines, suit for business gift5.Only one control cable with built in sound ... card driver and amplifer circuit needed, easy to operate6.Support for laptop, desktop, MP3, MP4, tape recorders, learning machines, ...