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This is a small sound module that plays the clang bell of a railroad grade crossing signal through a built-in speaker. It is a hobby part for model railroaders and diorama builders who want crossing sound at a layout crossing, not a full signal system. It is a single board with a speaker, so it covers the sound where a full crossing signal kit would also supply lights, gates and wiring. Buyers of these modules generally judge them on how the bell sounds and how easy they are to power and trigger.
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This is a sound effect board that produces grade crossing signal sounds, including a clang bell and tinkle. It comes with a speaker.