... , Sensing Distance 4m , NPN Transistor OutputE3Z-R61, E3Z-R61, 0.5M,E3Z-R61, 2M,E3Z-R61, 5M,E3Z-R61H,E3Z-R61K, 2M,E3Z ... Type , Pre-Wired Type , Sensing Distance 4m , NPN Transistor OutputE3Z-R61 2M Retroreflective Type , Pre-Wired Type , Sensing Distance 4m , ... NPN Transistor OutputE3Z-R61 5M Retroreflective Type , Pre-Wired Type , Sensing Distance 4m , ...