16 channel h.264 dvr Video Compression:H.264 support VGA, HDMI and USB2.0. Support SATA HDD&USB ... , time, video loss, camera lock, motion detection, recordingRecordingVideo/Audio CompressionH.264 / G.711Image ResolutionD1/4CIF(704×576/704×480) / CIF(352 ... control, 1 for backupRS232Dahua keyboard, PC communicationRS485PTZ control 16 channel h.264 dvr