The FM transmitter with miniature pocket size is portable to take. Simple operation. With digital PLL, transmission is stable in different environment. Full frequency range. There is memory for last frequency. The range is up to 10m, there is blue backlight, shine during night. With charging socket for iPhone or iPod at the bottom. It is powered by iPhone or iPod, no need other adaptor. And also the music can mute when there is call coming.