I experienced the product unusable when I had to turn the volume to maximum, both on the phone in the car stereo - hence the noise many others describe. Even at this level was the sound quality rare poor, even for being in FM transmitter.
The fittings were good, generous cord and included batteries as well. The lack of usefulness, however, I must rate the product 1 - Lousy.
I recommend Kjell & Company's small FM transmitter from Linocell (Art. 93 767) as a better alternative in the same price range, although my died after two years of hard use.
I have not used this in the car (yet), but if you put the 1cm next to a normal radio works great. If you walk two feet away can hear almost nothing.
On the "boost" the hint that one can amplify the signal so it applies only to certain models. It seems that there are several models. The one I got is not possible to "boost" according to the instructions I found on youtube.
FM transmitter is as I say weak, but it depends on the FM transmitter must not be too strong, so do not blame that it is bad, then it is as good as any other transmitter.
The rating may not be 10 because the price could well have been lower at such a relatively old product.
PS, the included batteries (from Electro World IAF) and the thing that fits biluttaget.
Miserable. Receive interference from the cell phone and always a bit noisy reception. No big shots at all actually.
Probably the worst purchase of 2010!
Have driven it as an MP3 player in two different cars.
* Unbelievably bad sound. Muffled and scratchy, especially the S-sound.
A custom mixed cassette from -91 with songs from music charts P3 has better sound than this. Despite being tampered back and forth with the settings / EQ.
* Clumsy designed with cigarette lighter cable and audio cable. Makes it hard to find a natural position for the transmitter.
* Took up the engine RPM and played up as a light howling sound in the background.
* Seems to be weak battery life anyway, but what does it do when you just get upset how bad the sound is!
Recommended really not!
It works. But the quality then?
Seems like the company forgot to spend a little of the sound of this.
The quality of the sounds is like a tape recorder if not worse, and disturbances all the time if you drive around in your car and so on.
Do not buy this.