1)4-channel Stand Alone H.264 DVR 2)2 channel alarm input, 1 channel alarm output 3)Real-time record and playback Details: ItemsSpecificationsVideo ... s), NTSC(525Line60f/s)Video Input4 Channel, BNC , 1.0V p-p/75 ohmVideo Output2 Channel, BNC, 1.0V p-p/ ... 75 ohm, VGA x 1Audio Input2 Channel, RCAAudio Output2 Channel, RCAAlarm Input2 Channel, Trigger closed without VoltageOpen or ClosedAlarm Output1 ...