... Type , Sensing Distance 4m , PNP Transistor Output E3Z-R81, E3Z Omron E3Z-R81 Retroreflective Photo-electric SensorPre-Wired Type , Sensing Distance ... Type , Sensing Distance 0.1 to 3m , PNP Transistor Output Omron E3Z-R81 Retroreflective Photo-electric Sensor