Features: 1) Operating distance: up to 30 meters 2) USB high-speed transmission, support built-in flash memory 3) Supports most kinds of flashes and USB hard disks 4) Supports FAT12 / FAM16 / FAT32 files 5) Automatically searches MP3 files, supports maximum five layers of file directory 6) The five buttons are se / previous / next / frequency adjustment / reset function each 7) Line-in function input jack 8) Input voltage: +12V, +24V 9) LCD: blue background light, can indicate current adopted frequency as well as the lyric that is playing 10) It has been developed from frequency phase lock loop ethnology, which ensures stable frequency radiation while functioning at a distance of up to 30 meters with no dead areas. It operates through your automobile audio sounding equipment so that you can still enjoy Hi-Fi music 11) Output current: 100mA max. (according to different model)