Optek Slotted Optical Switch sensor OPB900W55Z

Sensor aperature - .05" (1.27mm)
Emitter aperature - .05" (1.27mm)
Wire termination, buffered totem pole output
0.125" (3.18mm) slot width
max supply voltage 10v

I have a couple of different lengths, and connectors let me know on purchase which one you prefer.

B07706 - 16" long cable - 5 pin connector
B27901 - 4" long cable - 6 pin connector
B07536 - 17" long cable - 6 pin PCB connector