... can watch clearly within distance of 200m, very low noise, ² Laser illuminator can continuously works for 24 hours, only ... , builtin semiconductor cooling device, actually realize to control the internal temperature under normal working level.² Whole machine is ... DetectionON/OFF (4 Programmable Zone per Screen) CommunicationRS-232C TTL Level (2400, 4800, 9600, 19200, 38400, 57600, 115200bps) SSNRLow ...