The FireAngel FA6813 Carbon Monoxide Alarm features an advanced electrochemical sensor designed to accurately measure low levels of carbon monoxide in your home. This 10 year alarm is supplied with replaceable batteries, ensuring long-term protection. Common sources of carbon monoxide include oil and gas boilers, portable generators, oil or solid fuel cookers, gas or paraffin heaters, barbecues, clogged chimneys, wood or gas fireplaces, cigarette smoke, gas appliances, and any fossil fuel-burning appliance. Carbon monoxide is a poisonous gas emitted when fuel burning appliances burn incompletely. It cannot be smelt, tasted, or seen, making an audible CO alarm the only way to detect its presence. The FA6813 can be wall mounted using the provided screws or used portably, allowing it to be positioned as needed or taken with you when traveling. It features an easily accessible test button for simple functionality checks.