How works this bitcoin miner?

[xexio]

I interested in bought this bitcoin miner "Block Erupter Sapphire".
But my question is, how it works? I plug it into a USB port and works?

[stylesuxx]

Basically yes, IF you install some kind of mining software like cgminer.

[xexio]

But, the use of this hardware in my pc, when I mining bitcoin.
This affect a my CPU?

[stylesuxx]

I don't really understand your question. Can you maybe rephrase your question? 

[xexio]

The question is:

Once I connect the USB-miner, and put the cgminer to mine bitcoins.
This will make my CPU usage up to 100%?

[monbux]

But, the use of this hardware in my pc, when I mining bitcoin.
This affect a my CPU?

  It has no affect, you can choose to only mine bitcoin with this USB port ONLY.  You don't have to mine with CPU or GPU.  Just plug it in, install a miner, get all that stuff, and you're ready to go.

[xexio]

Ok, thanks!

But, I have another question.

For mining, what is the best hardware, a ASIC, an FPGA or a Graphic card?

[Nigeria Prince]

Ok, thanks!

But, I have another question.

For mining, what is the best hardware, a ASIC, an FPGA or a Graphic card?

High power graphic card is the best.

[xexio]

But, I read in a few web pages and forums that the ASIC is the best hardware for mining 

[b!z]

The question is:

Once I connect the USB-miner, and put the cgminer to mine bitcoins.
This will make my CPU usage up to 100%?

no, it will mine on the usb, not cpu