I had ordered my FM transmitter for my car because my CD player can not play MP3s and a "factory upgrade" by the vehicle manufacturer is extortionate. :-)
The transmitter is delivered exactly as it is described in the other reviews. Inexpensive and easy. The processing by the cheap plastic leaves no quality impression. One is afraid that he may fall down during transport and then breaks. Well, that can happen with a cell phone also. :-)
MP3s are played without complaint and the thing actually works exactly as you would imagine, aaaaaber:
When you leave the car and thus "de-energize" the cigarette lighter The unit records unfortunately only the MP3 file that has just been played. When you start the car again the player then begins the play again "pinned" MP3 file from scratch! :-(
While this may be ok at 3-minute music MP3s, etc. However if you 30 or 60 minutes long radio plays sounds, and then times stops short 5 minutes before closing, the car leaves, and then starts again ... it starts again from the beginning. And you have no way within the track to cue. There is only the opportunity to skip to the next track.
So definitely not a device for people who like to listen to MP3s longer ...