... Lin-ion 4.USB cable/remote control Features:This wireless laptop speakers can link to MP3, MP4, Notebook, CD, DVD, Mobile phone ... straightly.1)Support SD/USB/SMM card, Auto play function2)with Aux-in connection, support: MP3/MP4, computer, music mobile & iPod ... very good friend for tours & outdoor activities.7)LED display, with remote control,Support FM radio (optional) 8)Dual power supply ...