How would you recognize one?

It’s easy to identify one of these devices. All that separates them from being ordinary plastic coat hangers is a little aperture on top. The lenses are those. (Red highlights added)

In certain cases, the motion sensor may even include a side button that you must press to activate it.

On a white coat hanger, some people’s lights are dazzlingly bright and easy to see, yet on a black one, others may be harder to see.

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