Video Standard: PAL:50fields/second NTSC:60fields/second Digital Memory: PAL:720 x 576 NTSC:720 x 480 Video Input: 4 loops BNC 1.0Vp-p composite 75ohms Video Output: 1.0Vp-p 75 VCR Input: 1.0Vp-p 75 VCR Output: 1.0Vp-p 75 Alarm Input: 4 Active TTL High/Low Input(one mating connector) Alarm Output: 1 Programmable as Normally Open or Normally Close Alarm Duration: 0-30seconds Alarm Mode: Video Loss Alarm ,Video Motion Alarm, External Alarm Display Mode: Sequence Switch , Single picture, PIPZOOM Function, Four pictures, Freezing Power Consumption: DC12V 6W Net Weight: 1.3kg Ambient Temperature: -30 to 60 centigrade thermometer Dimension: 432mm(W) x 205mm(D) x 44mm(H)