An excellent choice for those looking to put on his car radio (with cassette) the music of his mp3. The sound is excellent, very simple and reasonable price use (within 5, to be compared with the 25 requested by Carrefour for the same product !!). I had for a year and a half Air Play (= one and a half its life, poor for a device more than 50) which is an FM transmitter (which puts her on the air mp3) and I find that the cassette adapter is definitely a much better product: simpler, cheaper and ultimately providing better sound quality because, with AirPlay, the waves are often blurred. Excellent choice, then.