These bells are replacing the mechanical bells because, they're much lighter, and that there are no moving parts.
A electronic chip embedded into the bell simulates a crossing bell, although not very well, from what I've heard. These types of bells can ring at 180°, or 360°. 180° bells are cheaper, but they aren't very loud and especially if you're on the opposite side of the bell. The 360° are louder, and can circle the whole signal.
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