... ) Multiple alarm trigger modes: video loss, motion detection, sensor input, missing & suspicious object, intruder, POS keyword, HDD fail, ... to upgrade system by USB drive Operation SystemVideo Card(stackable structure)3 optional Video extension cardsVideo InputVideo ... 352x288, 640x480, 720x288(NV7.5 version and above), 720x576Audio Input (Optional)TV OutputDisplay Rate (NTSC/PAL) fpsRecording Rate ( ...