OPB710 Optek, Phototransistor

OPB710 and OPB710F series of sensors from Optek consist of an infrared emitting diode and an NPN silicon phototransistor, mounted side-by-side on converging optical axes in a black plastic housing.
The interconnect wires for these devices are UL approved #26 AWG, with Teflon insulation, stripped & tinned.
The OPB700 and OPB701 have 4" (101 mm) wire length.

Reflective Optical Sensors, Optek