4 channel h.264 dvr Video Compression:H.264 support VGA, HDMI and USB2.0. Support ... BNC(1.0Vp-p, 75?)StandardNTSC(525Line, 60f/s), PAL(625Line, 50f/s)Output1 TV, BNC(1.0Vp-p, 75?), ... 1280×720, 1024×768, 800×600Tour DisplaySupportRecordingVideo/Audio CompressionH.264 / G.711Image ResolutionD1/4CIF(704×576/704×480) / ... 1 for backupRS232Dahua keyboard, PC communicationRS485PTZ control 4 channel h.264 dvr