... generator rooms, ordnance depots, confidential rooms, offices, intelligent housing estate, factories etc. with the digital network ... 1 it is connected with fire alarm, pry-proof alarm, open delayed alarm, stressing alarm etc. 2 set the time ... 20000pcs open recording,1200pcs blacklist. Communication transmission distance:1200m(RS485) long distance network communication(optional) overall dimension 131× ...