inputs.text: not play usb drive - purchased 3 units thinking would work like simular units purchased church past problehem record service place thehem flash drives mp3 format players insert drive play service music unit not get play usb not understand slot even not play music tried 3 devices incase bad one two units use units not comment features except like battery rehemoval recharge unit simular unit tried battery built dies unit trash clear charge inside unit plugged could replaced nice