Sound quality is great and volume is better than my old wired cassette adapter because my phone has independent basic audio and bluetooth controls. I had an issue with the belt throwing out/changing sides after the first use, but after removing the two inner smaller cogs everything works fine. Since other reviews have conflicting information on which gears to remove, I've included photos of two of my own. Not sure about the battery life as I've only used it a couple of times, but it's nice not to have cables running all over the car.
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