... 256pcs ports Operation Temperature - 40 C~70 C Operation Humidity 10-90 % RH , No Condensation Q ' ty of users 20,000 ... 3000m TCP/IP: Depends on net coverage area Collocations PCB board, case, power, power line, serial port communication line, software, ... able to alarm by hardware, if connected with strengthened expansion board, then is able to Security alarm ( function(){ var aBigImageSrc = [ 'http ...