"Lb" is the signal for a low battery. The capital L with a lower case b on your digital display is letting you know the battery is low and needs to be replaced.
The leading cause of accidental poisoning deaths in North America, Carbon Monoxide (CO) is odorless, tasteless and invisible – it's a silent killer. The only safe way to know if carbon monoxide is present is to install carbon monoxide detectors (alarms) on every level of your home and in sleeping areas. Kidde has been making CO alarms with electrochemical sensing technology for years.
Smoke + Carbon Monoxide Alarm with Indoor Air Quality Monitor
Smoke + Carbon Monoxide Alarm with smart features
Kidde Sealed Lithium Battery Power Carbon Monoxide Alarm with Digital Display
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