Product Description Standalone DVR Features: 1. MPEG4 Compression & Network Transmission 2. SOC Single Chip, High Stability 3. Linux Operation System 4. Full-D1 Live Monitoring, Each or Quad Display 5. High-Resolution Playback Picture Quality 6. Audio Recording Available 7. Motion Detection & Sensor Triggered Recording 8. Motion Detection: Settable Area & Sensitivity 9. Support Hiding an Appointed Channel 10. Configurable Record Picture Quality & Frame Rate 11. Network: IE Based Monitoring 12. With Remote Control & Removable Hard Drive Tray 13. Support PTZ Control Via Built-in RS-485 Port 14. Video Loss Alarm Function 15. Password Protection 16. Built-in USB2.0 Port for Video Backup to Computer 17. Self-Recovery After Power Reconnected