... , event searching, recording group searching. Backup modes: network backup, USB 2.0 backup. Support RS-485 PTZ ... operation. Multiplex operation: live ,record , playback, network can be operated at the same time.Specifications: Model4 ... multi-channel recording, simultaneous video playback and simultaneous network operation.Video CompressionH.264Audio CompressionG.711ARecording ModeManual, Timing, ...