2. Support 4-bay SATA Hard Disk

3. Support RAID 1, 5, 6 for Data Protection

4. Built-in Real-Time Video Intelligence Detection

5. Built-in Dual Display

6. Support Surveon Control Center (SCC)

7. In-House Design & Production

8. 2-Year Warranty

More Details: http://www.surveon.com/product/NVR3304.asp