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The requirement for a smoke detector's indicator light to be green typically signifies that the device is functioning properly and is powered. A green light indicates normal operation, providing assurance that the smoke detector is active and ready to detect smoke or fire when necessary.

While blinking lights might signify some form of activity or malfunction depending on the manufacturer's design, the presence of a steady green light is a common standard across many devices, ensuring clarity and reliability in signaling that the detector is operational.

Red lights can often indicate a warning or malfunction, such as the need for maintenance, the presence of smoke, or the activation of an alarm, which is why green is the preferred indicator for normal function. The option suggesting that the indicator can be any color overlooks the standard practice in smoke detector operation, which emphasizes the importance of a specific color to convey its status effectively.