Honeywell offers three versions of its battery powered CO alarms, with different user interfaces and lifetime: The basic model XC70 uses indicator lights to visually signal the state of the unit and comes with 7 years life and warranty.
Honeywell offers three versions of its battery powered CO alarms, with different user interfaces and lifetime: XC100 and XC100D both show big alarm messages in the case of an alarm, and both come with 10 years life and warranty.