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![800-9201 OS-1 Opto-Sensor (Pkg. 1) - MPM Hobbies](http://mpmhobbies.com/cdn/shop/files/800-9201-os-1-opto-sensor-pkg-1-mpm-hobbies_436x436.jpg?v=1705821421)
These are the same parts provided with all of CIRCUITRON’ s Detection and Reversing Circuits. They may be used for replacements if the originals become damaged. They may also be used to extend detection to sidings and spurs.