Sony CPA-9 Cassette Adapter for automibile, helpful, efficient but a lot of breath

This adapter lets you connect an Mp3 / Mp4 player with cassette player to the sound quality variable; relatively correct for punchy music like rock and metal but uncertain quality downright poor for quieter classical music type.
However, the player's settings allow you to catch the sound quality but breath still important and sometimes embarrassing.

Verdict: troubleshoots and worth it for a reasonable investment.