Carbon monoxide alarm, providing safety at home. The alarm is a battery operated unit with minimum 12 months battery life. Easy to install and automatic self diagnostic check. 85db alarm at 1 metre (3 feet). CO test facility. Exposure to carbon monoxide (CO) can lead to unconciousness, brain damage and ultimately death. It cannot be detected by the human senses as you cant see it, smell it, taste it or feel it. More at risk are children, unborn babies, pregnant mothers and the elderly.