VideoSecu 4 Channel PCI PC DVR Card CCTV Security Camera System, including 4 Outdoor Infrared CCD Security Cameras, 1 of 4 Channel Camera Power Supply, 4 of 50 Feet Camera Extension Cable 1G5 Easier to use Real time display with multi-screen views; 4 Weatherproof Outdoor Day Night Vision CCD 420TVL Security Cameras 30 fps recording and display. Simultaneously record and monitor 4 cameras Advanced event search features: search recorded files by year, month, date, hour Cards are stackable, expendable to 16 channel;Digital duplex operation, AVI file back up; free surveillance DeCal included Computer Requirement: desktop PC