AudioQuest Pearl 0.75m (2.46 ft.) Standard to Micro USB Cable Pearl's solid LongGrain Copper allows a smoother and clearer sound than cables using regular OFHC (OxygenFree HighConductivity) copper. Pearl USB uses airfilled FoamedPolyethylene Insulation because air absorbs next to no energy and Polyethylene is lowloss and has a benign distortion profile. Precision goldplated plugs are carefully attached with the very best solder. The difference you hear between solders is a result of connection quality. AQ solder does not have a high silver content because the more silver there is in solder, the more difficult it is to make a good connection. USB (Universal Serial BUS) was established by a stalwart group of companies such as Intel, HewlettPackard, and Microsoft (just to name a few) in order to give the personal computing world a truly universal standard and means to connect devices such as hard drives, printers, cameras, and, more importantly to us, audio components.