| Model | 
          NRS-04 | 
          NRS-08 | 
          NRS-16 | 
        
    
      |  IP Video Input | 
      4 CH | 
      8 CH  | 
      16 CH | 
    
    
      | Two-way Audio Input | 
       1 CH, RCA (2.0 Vp-p, 1K Ω) | 
    
    
      | Network Incoming Bandwidth | 
       25 Mbps | 
      50 Mbps | 
      100 Mbps | 
    
    
      | Network Outgoing Bandwidth | 
      80 Mbps | 
      240 Mbps | 
    
    
      | Remote Connection | 
      128 | 
    
    
      | Recording Resolution | 
       5MP/3MP/1080P/UXGA/720P/VGA/4CIF/DCIF/2CIF/CIF/QCIF | 
    
    
      | Frame Rate | 
      Main stream: 50 fps (P) / 60 fps (N) 
        Sub-stream: 50 fps (P) / 60 fps (N) | 
      Main stream: 25 fps (P) / 30 fps (N) 
        Sub-stream: 25 fps (P) / 30 fps (N) | 
    
    
      | CVBS Output | 
      N/A | 
      1-ch, BNC (1.0 Vp-p, 75 Ω) 
        Resolution: 704 × 576 (PAL); 704 × 480 (NTSC) | 
        | 
    
    
      | HDMI Output | 
      1 CH, resolution: 
        1920 × 1080P /60Hz, 1600 × 1200 /60Hz, 1280 × 1024 /60Hz, 1280 × 720 /60Hz, 1024 × 768 /60Hz | 
      1 CH, resolution: 
        1920 × 1080P /60Hz, 1920 × 1080P / 50Hz, 1600 × 1200 /60Hz, 1280 × 1024 /60Hz, 
        1280 × 720 /60Hz, 1024 × 768 /60Hz | 
        | 
    
    
      | VGA Output | 
      1 CH, resolution: 
        1920 × 1080P /60Hz, 1600 × 1200 /60Hz, 1280 × 1024 /60Hz, 1280 × 720 /60Hz, 1024 × 768 /60Hz | 
      1 CH, resolution: 
        1920 × 1080P /60Hz, 1600 × 1200 /60Hz, 1280 × 1024 /60Hz, 1280 × 720 /60Hz, 1024 × 768 | 
        | 
    
    
      | Audio Output | 
       1 CH, RCA (Linear, 1kΩ) | 
      2 CH, BNC (Linear, 600Ω) | 
    
    
      | Decoding Live View / Playback Resolution | 
       5MP/3MP/1080p/UXGA/720p/VGA/4CIF/DCIF/2CIF/CIF/QCIF | 
      
    
      | Decoding Capability | 
       4CH@1080P | 
      8CH@720P, 8-ch@1080P | 
      16-ch@720P, 16-ch@1080P | 
    
    
      | SATA HDD | 
       1 SATA Interface | 
      2 SATA Interface | 
       4 SATA interfaces for 2 HDDs + 1 DVD-R/W (default), or 4HDDs | 
    
    
      | eSATA HDD | 
      N/A | 
      1 eSATA interface | 
    
    
      | Hard Disk Capacity | 
       Up to 4 TB capacity for each disk | 
    
    
      | Network Interface | 
       1 RJ-45 10 /100 /1000 Mbps self-adaptive Ethernet interface | 
      
    
      | Serial Interface | 
      N/A | 
      RS-232; RS-485; Keyboard | 
    
    
      | USB Port | 
      2x USB 2.0 | 
      3x USB 2.0 | 
    
    
      | Alarm Input / Output | 
       N/A | 
      16 / 4 | 
    
    
      | PoE Port | 
      4 independent 100 Mbps PoE 
        network interfaces | 
      8 independent 100 Mbps PoE network interfaces | 
      16 independent 100 Mbps PoE network interfaces | 
    
    
      | PoE Max. Power | 
      50W | 
      120W | 
      200W | 
    
    
      | Supported Standard | 
      AF and AT | 
      
    
      | Power Source | 
       48V DC | 
      100~240V AC | 
      100~240VAC, 6.3A, 50 ~ 60Hz | 
    
    
      | Power Consumption (without hard disks) | 
      < 10W | 
      < 40W | 
      
    
      | Working Temperature | 
       14°F ~ 131°F / -10°C ~ 55°C | 
    
    
      | Working Humidity | 
       10% ~ 90% | 
    
    
      | Chassis | 
       1U Chassis | 
      19-inch rack-mounted 1U chassis | 
      19-inch rack-mounted 1.5U chassis | 
    
    
      | Dimensions | 
      12.4 x 9.1 x 1.8 inches /  
        315 x 230 x 45 mm | 
      17.5 x 11.4 x 1.8 inches / 
        445 x 290 x 45 mm | 
      17.52 x 15.35 x 2.76 inches /  
        445 x 390 x 70 mm | 
    
    
      | Net Weight | 
      2.2 lb / 1 Kg | 
      8.8 lbs / 4 Kg |