In addition to the high-speed eSATA and all-digital DVI video interfaces, the ViewSonic PC mini 530/550 also has six USB 2.0 ports (two on the front panel, four on the back) for keyboards, mice, storage devices, card readers, joysticks, digital cameras and anything USB – the possibility is limitless. We know you like good music, so we gave the PC mini 530/550 both analog audio input/output and the high-end S/PDIF port for you to hook up with professional audio equipment or components.