B/W Observation System FEATURES Vertical interval switching with synchronized cameras. Camera input skip function. Multi-alarm processing. Two way audio. SPECIFICATIONS MODEL COS-1212L Signal EIA/CCIR Supply voltage 120V 60Hz / 230V 50Hz Power consumption 47W (with 4 cameras) Picture tube 12" B/W   90 Deflection Angle Resolution More than 800 Lines at center Video inputs 4 Cameras on the monitor  1 from VCR, range : 1 Vp-p, Impedance : 75O terminated Camera looping out Video outputs Modular  Jack (VCR Cable) Audio inputs 4 Cameras on the monitor 1 from electorate condenser microphone (internal connection) 1 from VCR Audio outputs 1 to speaker (internal connection), 1 to VCR Channel switching time 1 to 60 seconds (adjustable) Alarm hold time 45 seconds (fixed) Alarm dwell time 4 seconds (fixed) Dimensions(W*D*H) 306mm * 326mm * 292mm Weight 6.8Kg