... standalone DVR, 4ch,8ch,16ch, H.264compression Linux operating system VGA, USB can choose support 4 X 500GB SATA HDD Stand alone DVR ... / BNC 2-ch BNC: 8-ch / BNC 2-ch BNC: 16-ch / BNC 2-chAudio RCA :4-ch / 1-ch RCA ... inputs / 1-ch output 8-ch inputs / 1-ch output 16-ch inputs / 1-ch outputNetwork H.264 transmission, RJ45, TCP ...