First Alert ReadyGuard Plus User Manual page 15

About the Display and Indicators
LED Meanings
ARMED LED:
(Red)
READY LED:
(Green)
ON = System armed
OFF = System disarmed
Blinking = System armed, but a fault exists
Blinking alternately with READY LED = AVM (VOX or Talk) or
speaker phone mode is active
ON = System disarmed, ready to arm
OFF = System armed
Blinking = System disarmed, not ready to arm (a fault exists)
Blinking alternately with ARMED LED = AVM (VOX or Talk) or
speaker phone mode is active.
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