... 485, remote control DVR 4CH video output and 1CH Audio real time DVR D1, VGA support DDNS, RJ 45, RS-485, ... IMPERXTECH 16CH Real time DVR, Economical, Free DDNS Network DVR For security system network DVR recorderDVR recorder16CH video and 4CH Audio real time Recording ... Control1 RS485Hard Disk2 SATA ports(Max 2000G) IMPERXTECH 16CH Real time DVR, Economical, Free DDNS Network DVR For security system