The idea is that in the event of a fire, those devices can be set to to automatically unlock, which potentially speeds both your egress but also spares your doors from a battering by a firemans ax
This method is ideal for large-volume orders
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They always maintained popularity over Capri, Eve, More, Saratoga (discontinued), Max (discontinued), and Style (discontinued)
Theyre just small metal tubes worn on a chain around the neck (bracelets are also available)