Support max 2TB HDD,Double Screen video output,select songs OSD menu ... and MTV video display on television screen. Function:Double Screen diaplay: AV+VGASupport biggest to 2000G SATA/ ... manage MTV songs,Select songs by OSD MENU,Double Screen video outputs,that select songs OSD menu ... KARAOKE machine by USB2.0 port, use the songlist manage software to add new songs for updata new songlist file then ...