Final answer:
An emergency alarm box is indicated by a blue light, which helps individuals quickly locate it in case of an emergency.
Step-by-step explanation:
The location of an emergency alarm box is typically indicated by a blue light. Emergency alarm boxes are essential for maintaining safety in public areas, and the blue light is universally recognized to signal the presence of emergency equipment or call points. In cases of emergency, individuals can look for the distinct blue light to quickly locate the alarm box to call for help.