TsirTech® Audio USB Portable Cassette Tape-to-MP3 Player Adapter with USB Cable and Software Cd Also Features Auto Reverse - FOR PC
I own this device and one other very similar but made by a different manufacturer.  It is a waste of money and time.  The motor doesn't have enough power to transport the tape smoothly and so the resulting MP3 sounds like garbage.  The tape was new so that wasn't the problem and it happened with both devices.  Their price is indicative of the quality you're not getting.