ITEM NAME:External USB Sound Card Channel 5.1 7.1 Optical Audio Card Adapter for PC #gib Store Home Promotion Hot Item Add to Fav.Line in= line input: input audio such as MP3 to sound card, edit and edit it on computer. SPDIF OUT= fiber output: general output to the optical fiber amplifier or decoder (digital signal). Front out= pre output: 2 channel insert headphones or speakers /4 channel above insert front speakers.
