The half red LED ring indicates Alexa is on mute. This is specific to Alexa functionality and shows that your device is not listening. If you wish to unmute your Alexa, go to the Onelink Home app and select the quick command with the circle, and your device will respond when you say “Alexa.”
The half red ring does not indicate any type of emergency. Because the Onelink Safe & sound is also a safety device a full red ring (accompanied with a loud, 85 decibel alarm) indicates there is an emergency. In the event of a smoke or carbon monoxide emergency, the LED will flash completely red and you will hear the loud beep.