The wireless WNX-402G Passive Infrared Sensor from Optex gives superior detection with high performance against false alarms. With an excellent tolerance to spot temperature changes from movements of blinds, curtains and nuisance animals, the WNX-40 uses OPTEX's patented Quad Zone Logic to accurately discriminate between humans and other sources of infrared heat. The WFX-402G includes a built-in transmitter compatible with 2GIG Wireless Systems.