Main features: 1.MCU processing, anti-false alarm efficiently 2.Double temperature compensation 3.Pulse count adjustment 4.Anti white light interference 5.Anti RF interference(20V/m-1GHz) 6.Fresnel lens 7.Wall / corner mounted 8.Alarm output NC / NO optional 9.SMT manufacture technology 10.Execute criterion: GB10408.1, GB10408.5