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Description:Characteristic: advantage1: one upstream port and four downstream usb port advantage2: switch for self and bus power advantage3: led for work state Features: 1) Hot plug-and-play USB interface, eliminates the need for traditional sound cards 2) Multi-channel technique, 5.1-channel stereosound effects 3) Dynamic surround background sound effects 4) Virtual speaker shifter 5) Easy to switch to microphone or speaker mode 6) Available mixed stereo effects; Karaoke 7) Microhone record function 8) 16 rhythm modes 9) 23 environment sound effects 10) Transforms analogy sound signal (microphone, CD, MP3, TV, Radio, etc) to digital signal