Self-check: A central multi-functional test and hush button used to verify the internal electronics or silence a non-emergency alarm. [1]
Lifetime: A status indicator mapping out the health and remaining operational lifespan of the internal gas sensor.
Run: A green indicator verifying that the unit is powered on and functioning normally.
Fault: A yellow status indicator signaling an internal circuit error, sensor malfunction, or end-of-life status.
Alarm: A red indicator paired with an integrated buzzer that flashes and sounds a loud siren upon detecting a gas concentration above safe limits. [1, 2]
