An amazing product. Although its assembly remains kept as a military secret, this machine has amazing capabilities.
Its purpose is to amplify and filter USB signal and return it in its full bandwidth, with the key to a marked improvement in what he gives to connect.
In the end, I use either to connect my M-Audio sound card with audio rendering becomes suddenly defatted any artifact or between a PC and a DAC eg, making a leap of musicality at all.
Paid 100 €, it seems expensive, but given the services rendered, soon proves essential ...