1) 8 composite video inputs 2) Intel P4 2.4G or above CPU is recommended 3) Main board based on Intel's chipset is recommended 4) At least 128MB of RAM (256MB required for 16 cameras) 5) At lease 64MB of RAM for display adaptor ATI Radeon 7000 or above and Nvidia 6) Geforce series is recommended 7) Require Windows 2000,XP(NTFS file system is recommended) 8) Windows Direct X8.1 and above. 9) Latest Display adapter driver.