Digital video recorder Technical specification: Video signal system Ntsc/pal Number of video input Four groups Number of video output One group Display sheet number 120fps/s at most 4f-30fps/s 100fps/s at most 4f-25fps/s Record sheet number (combination mode) Ntsc 30fps at most Pal 25fps at most Record sheet number (independent mode) Ntsc 7.5fps at most 30fpsf-4 Pal 6.25fps at most 25fpsf-4 Resolution Display Ntsc:720f-480 pal:720f-576 Record Ntsc:720f-480(combination mode) Pal:720f-576( combination mode ) Hard disk Over 80g Alarm input 4 input, 1 output System detection Record mode auto recovery in power failure without loss of data Power specification Dc 12v/5a