... 720P recording NVR 1,4CH digital video input 2,4CH 720P recording 3,H.264 compression ... 1CH simulation BNC/VGA video out 4CH digital video input 4CH 720P recording NVR H,264 NVR standalone1, ... 4CH digital video input,4CH 720P recording 2, adopt standard H.264 ... 3, 1CH simulation BNC/VGA video output, 1CH audio input, 4, support audio intercom VGA supports 1280*1024 5 ...