Video In Standard 4 channels video in BNC jack Audio In Standard 2 channels audio in RCA jack Video resolution NTSC 640 x 480 pixels / PAL 704 x 576 pixels Compression Technique SMICT Compression Chip. Dynamic Compression rate can reach 1:40~1:2400 max PC Interface Standard PCI Slot Watchdog Hardware type watchdog function I/O Each card provide 8 I/O points Recording Speed Maximum of 240 fps for 16 channels OS system Windows 2000/XP/Vista