... retractable handle and wheels for easy carring.4.with USB /SD Jack, can read and play song.5.Digital microphone ... 8”*1+3“*1Resistence8 OHMMeterialWood/metalConnectorWith 5.5Ah battery , USB / SD card reader ,digitalMP3 inputCompetible format dvd,svcd,MP3,MP4,WMA ... cord,wireless microphone, wireless earphone,remote control,AV cable Hot Selling 15inch 90W Black Portable PA system with USB,SD reader,Mics