... ,USB mouseSupport 2*USB 2.0 port for mouse,backup,DVD-RW,movable hard disk,upgrade etc...Alarm triggering screen tips,buzzer ... and NetworkBackup ModeNetwork download/Flash stick/movable HDD/SATA HDD/DVD-RWInterfaceVideo Input4channel8channel16channelVideo Output2channel TV output BNC,1.0Vp-p,75 ...