| Video Compression:  |  H.264 |  
  | Video input:  |  4-ch, BNC(1Vp-p, 75Ω) |  
  | Audio compression:  |  OggVorbis |  
  | Audio input:  |  4-ch, BNC(2Vp-p, 1kΩ) |  
  | Two-way audio:  |  1-ch, MIC connector |  
  | Video loop out:  |  DB26 connector (Optional) |  
  | Audio output:  |  1-ch, MIC connector |  
  | Encoding resolution:  |  4CIF/DCIF/2CIF/CIF/QCIF |  
  | Frame rate:  |  QCIF/CIF/2CIF /DCIF/4CIF:25(P)/30(N) |  
  | Video bit rate:  |  32Kbps~2048Kbps, or user-defined (Max.3Mbps) |  
  | Dual Stream:  |  Support |  
  | Stream Type:  |  Video/ Video&Audio |  
  | Type:  |  1 SATA interface |  
  | Capacity:  |  Up to 2TB capacity for each disk. |  
  | Network interface:  |  1 RJ45 10/100/1000Mbps self-adaptive UTP Ethernet interface |  
  | Serial interface:  |  1 RS-485, 1 RS-232 |  
  | USB interface:  |  - |  
  | SATA interface:  |  1 SATA interface |  
  | Alarm in:  |  16-ch |  
  | Alarm out:  |  4-ch |  
  | Chassis:  |  1U, 19-inch; Rear panel provides Reset button |  
  | Power supply:  |  100~240VAC, 6.3A, 50~60Hz |  
  | Consumption:  |  ≤40W (without HDD) |  
  | Working temperature:  |  -10°C~+55°C(14°F~131°F) |  
  | Working humidity:  |  10%~90% |  
  | Dimension(W×D×H):  |  440(D)×300(W)×45mm(H)(17.32"(D)×11.81(W)×1.77"(H)) |  
  | Weight(without HDD):  |  ≤5000g(11.02lbs) |