Function: karaoke, USB reader, FM, PC player, mobile player,promotional gift; 1.The ... Mp3,Mp4,cellphone,FM radio ,easy to apply to PC,mobile phone,easy to carry it everywhere.2) ... .==PLAY MUSIC FORM U-DISK,SUPPORT MP3 FORMAT.==APPLY PC,MOBILE PHONE,MP3 AND OTHER AUDIO SOURCE ==FM RADIO ... RATIO:>=75 DB==FREQUENCY RESPONSE:100HZ~18KHZ Portable speaker,multimedia speaker,small speaker,FM speaker HM-MPR4