Specification:

True Triplex Functionality Simultaneously(Playback, Record, Network, and USB/DVD-RW Media Back-up)
Supports 60fps under NTSC, 50fps under PAL for recording
PS/2 mouse interface
Individual record frame adjustment for each channel video color adjustment, event list
RS-485 interface for PT camera control Multiuser network monitoring & remote DVR controlling (up to 2 users)
Fast CD-RW (avg. 2MB/sec) & host USB (avg. 300-KB/sec) drive audio recording
Firmware upgrade via USB