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Z-Stuff for Trains DZ-1040U Upper Quadrant Semaphore Signal for O & O-27 Train Layouts
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Base has built-in optical sensors with sensitivity adjustment. Height 7 1/2". For O and O-27 gauge train layouts.
Just connect the signal to power and put it next to the track. That's all it takes to make it work. Built in sensor in base. Wiring instructions on back of package.
New in the package.