... mini vibration speaker 1.USB speaker 2.round shape vibrition speaker 3.support TF/SD card 4.wireless ... speaker1.elegant syle portable mini speaker, unique appearance2.round shape, delicate design.3.outstanding powerful sound effect Product ... ; mobile phone, desktop, laptop...PowerUSB power supply, Li-battery powerDrive unit40mm*2*3wS/N ratio80dbFrequency80-20khzInputDC5v/ 500mahOutput5v 80mahColorRed, ...