Long hallways
Basement stairwells
Back doors and garages
Storefront entrances
Around safes or valuables
They often appear as:
Small rectangular units (~2x3 inches)
Black casing with a reddish glass or plastic lens
Mounted high on walls (5–7 feet up)
Always in pairs, directly facing each other
If one side is missing, look carefully—the partner may be hidden behind paint, drywall, or furniture.
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