... output or NPN / PNP output 2.With or without controller 3.Resolution available for 20,30,40,80mm 1.Features ... selection for users.* Light axis pitch: 10mm, 20mm, 40mm and 80mm.* Composed of separate emitter, receiver(reflector), controller, cable connector and installation ... function to avoid output wrong signals to control circuit.* Dual relay and to avoid output wrong signals for safety purpose ...