Zalman ZM-RSSC External USB 5.1 Sound Card

I want to know more about sound cards before buying. Can you please provide me information about Zalman XM-RSSC USB 5.1? What are the specifications of this sound card? How beneficial is it to use an external sound card rather than internal? How much is it in the market? Can you tell me how to install it? What are the ports available for this sound card? Does it include any connectors? Does it provide controllers? Can I improve an edit it settings using its software? Please provide information about this. Thank you!
