1.USB laptop speaker 2.Audio speaker 3.Applicable to USB,SD/MMC card,mini TF 4.card,computer,mobile,MP3,MP4,Ipod iphone ... , speakers, overall appearance cabinet and delicate your MP3, MP4, CD or notebook computer audio etc. For better efficacy. Reference coefficientOutput powerFrequency ... .productShow(); oProductShow.init( { 'aImgSrc': aBigImageSrc } ); } )(); Two speakers USB laptop audio speaker