Carbon Monoxide (CO) is an invisible, odourless and tasteless gas that is toxic to humans and animals, not to be confused with Carbon Dioxide (CO2). Faulty and solid-fuel-burning appliances and even temporary environmental changes can cause carbon monoxide (CO) poisoning in the home, with potentially fatal consequences. Our range of CO alarms are designed for all types of home, including leisure accommodation, guest houses and caravans. The CO alarm is battery operated and easy to fit � either as wall or ceiling mounted � with a low-power chip that helps it last for 10 years in standby mode.