... monitor output Technical Parameter ModelHW-SCharacteristicsHW-SVR73044 chs video input, 1 chs audio input, D1 preview resolution, SATA HDD supported, ... supported, VGA output supported.HW-SVR73088 chs video input, 1 chs audio input, D1 preview resolution, SATA HDD supported, ... supported, VGA output supported.HW-SVR731616 chs video input, 4 chs audio input, D1 preview resolution, SATA HDD supported, ...