... music;Strong BASS,perfect sound effectMODEL:AD-315 mini vibration speaker,1. Patented technology;Zinc alloy metal material shell;small,simple ... .5W Frequency:100Hz~20kHz support MP3, MP4,PC,Iphone,ipod, computer,mobile and etc standard 3.5mm audio plug 3.Technology ... principle of resonace.It broke through the limitations of traditional speaker propagation region,so that the sound can be transmision all ...