Products Number:CCH-528 　　　　 1.FM wireless radiation function, support the frequencies from 87.7 MHz to 88.9 MHz and from 106.7 MHz to 107.9 MHz. 2.USB high-speed transmission; 3.Support most kinds of flashes and USB hard disks; 4.Support FAT 12/FAM16/FAT/32 file format; 5.Automatically search Mp3 files, support maximum five layers of file directory. 6.The five buttons are for playing /pause/previous/next/frequency adjustment/ reset function each; 7.LINE-IN function input jack; 8.Input voltage:+12V+24V; 9.LED: green or red light indicates playing status; green light indicates which frequency is just using.