I think you are right. I have now second thoughts about this product concering the 16bit resolution. (did not know thats so bad)
Thanks for your comments, can you commend another audio interface within the price range?
/edit
Huh, it seems like the device I am looking for is called 'mic preamp' and not 'audio interface'
As far as I could find out, audio interfaces usually offer mic preamps but are designed for recording guitar without microphones, right?
I want to record the sound of my amp with the help of a microphon, so a mic preamp would do the job.
This one looks nice(according to the reviews I have read), but I was not able to finde out what cables I have to use to connect it with the line in port of my soundcard.
By the way, what sort of power supply do I need for this device, will a normal 9V power supply do?
Thanks, for helping me and sorry for the trouble