Kidde i9010CA User Manual page 13

Operation
LED Indicator
This alarm is equipped with a red LED indicator, with four
modes of operation.
Red LED - Flashing every 40-45 seconds: Indicates that the
smoke alarm is receiving power and operating properly.
Red LED - Flashing (1 second on - 1 second off): When the
smoke alarm senses particles of combustion and goes into
alarm (constant pulsating sound), the red LED will flash
(approximately one flash per second). The flashing LED
and pulsating alarm will continue until the air is cleared.
Red LED - Flashing slowly (1 second on - 8 seconds off):
Indicates that the unit is in the Hush ® mode.
Red LED - Flashing rapidly when the Test button is pressed:
This unit features an "alarm memory" to inform you if the
alarm has sounded since the Test button was last pressed.
The alarm memory will cause the red LED to flash rapidly
when the Test button is pressed. The alarm memory is
reset when the Test button is released.
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