Basics I bought a FM Transmitter on line that costed me only $7.99. At that price I had to give it a try, hoping to find an FM transmitter I'm satisfied with. Design When this arrived, I was a bit startled, because the screen seemed misplaced. I opened it and saw that it was only the plate providing the background light. I placed it correctly, and then it's all fine. Still, it should have been a perfect one, though sometimes the factory's or the courier's errors are unavoidable. Also, the "up" button is a bit slow/needs to be pushed hard. The design is pretty standard for these kinds of transmitters. Shaped like a bean, with two power ports (a car adapter is included) and room for batteries (2 AA's). It has an on/off button, up/down and three buttons on the front for setup and saving channels. Features I'm not quite sure who needs a thermometer or a clock on an FM transmitter, but it's there nonetheless, and of course it doesn’t hurt. The transmitter features full frequency range from 87 to 108.5 MHz with 0.1 MHz intervals. This way, you can always find an unoccupied channel. The display shows the time and temperature when you turn it on, and if you hit the on/off button again it will go into transmitter mode, then you can choose frequency. You can also browse and store 10 preset frequencies using the three buttons under the LCD, that's a very nice feature that allows you to quickly find the right setup if you use it very often in different places. As I said it has two power ports, I haven't tried either the USB or the car adapter, but I'm sure it works. It's nice to have several methods of running the thing depending on where you use it. In use I have tested a LOT of FM transmitters, either they have SQ issues or they're too weak to give a decent signal. Now, FM transmitters will never be comparable to cables, but if you have a car with a radio or just want to play your music on anything with a radio, they're good enough. This one has a decent range. I tested it through a brick wall, about 15 feet from the radio, it worked fine. It all depends on how close your channel and the real radio channels are on the band, but 15 feet with not much signal loss isn't bad and even more than enough for use in cars etc. Compared to others I've tried, the sound quality was very good, even though there was still a noticeable amount of hiss, but that's to be expected. Bottom line is that if you have a nice stereo either in your car or at home, then chances are there will be a line-in. If you don't, then you won't get hi-fi sound by any means. In my opinion an FM transmitter works well enough in a car etc with some background noise. Conclusion The slow button and the misplaced background light plate wasn't a good thing, but for the price I'm quite satisfied with its performance. Sound quality is OK and Its range is more than good enough for my use. For less than $8(including shipping fee), there is really not much to complain over with this dirt-cheap thing(From sinamalls). It works well, has nice features.