Difference between neurological and neurovascular

Neurological has to do with the anatomical functions and organic disorders of nerves and the nervous system. Neurological conditions usually affect the brain and the spinal cord. Neurovascular has to do with anatomical functions and organic disorders of nerves and blood vessels. It pertains to both nervous and the vascular elements, it has to do with the structure and functions of the vascular and the nervous system. 

CO alarms have a life expectancy of around seven years. The CO alarm will beep every 30 seconds or display ERR or END. If a CO alarm is at its end-of-life, replacing the battery will not stop the beep. Most detectors will beep 4 or 5 times in a row about every 4 seconds. Do not mistake dangerous levels of poisonous gas for a detector with low battery.

Explanation: (credits to the internet) Hope this helped! :D