I was sceptical at first due to reviews. First time ive tried it was very noisy and sound was non existent. After some figuring out and diagnostic, Ive found out that the dolby noise reduction system was muting the cassette. To fix this you have to plug the cassette first into the radio. Than plug your aux cord. After playing with the sound of my phone (set at 70%) and the equalizer on my phone (bass boost) I got decent sound of way better quality than fm transmitters. No noisy operation, no hissing, bass is decent, sound is loud and clear. I recomand if I don’t modify this review it means it still works.