... Output:90W 3.Battery5.5Ah 4.Support USB,SD card,MP3 input 5.telescoping handle&Caster Wheel ... and wheels for easy carring.4.with USB /SD Jack, can read and play song.5.Digital ... “*1Resistence8 OHMMeterialWood/metalConnectorWith 5.5Ah battery , USB / SD card reader ,digitalMP3 inputCompetible format dvd,svcd,MP3,MP4 ... control,AV cable Hot Selling 15inch 90W Black Portable PA system with USB,SD reader,Mics