The FireAngel FA6813 is a carbon monoxide alarm supplied with 1 year replaceable batteries. This advanced electrochemical sensor accurately measures low levels of carbon monoxide in your home. The unit can be wall mounted using the provided screws or used as a portable device, offering protection wherever needed, including while traveling. A user-friendly test button simplifies regular checks. This CO detector is suitable for private and rented homes in England, Wales, and Ireland. It is important to note that due to its replaceable batteries, it does not comply with the new Scottish Fire and CO laws as of February 2022. Carbon monoxide is a poisonous, odorless, tasteless, and invisible gas produced by incomplete combustion of fossil fuels. An audible CO alarm is the only way to detect this potentially deadly gas. 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, and other fossil fuel burning appliances.