Function: The key inside is accessed by breaking the front glass (or plastic) panel. This allows emergency responders or building occupants quick access to locked areas during a fire or other emergency.
Design & Material: The box is typically made from a durable, high-visibility red ABS plastic with a screen-printed cover that clearly states "BREAK GLASS FOR KEY".
Installation: These units are installed on walls in strategic locations like near fire alarm pull stations or emergency exits.