Electrochemical carbon monoxide sensing technology - CO, heat and smoke alarms for home are essential for fire safety. This CO alarm uses electrochemical technology to keep you and your family safe 10 year product life and 5 year warranty - the Firechief standalone carbon monoxide alarm is a reliable solution for detecting dangerous levels of gas that can be emitted from fuel-burning appliances Sealed 10 year lithium-ion battery - a CO alarm is a must in every home so this alarm is supplied with a sealed long-lasting battery and a failsafe backing so it cannot be removed Audible alarm and visual alerts - safety sensors & detectors must notify you of potential danger immediately. These CO alarms have a double alert system and give you time to evacuate safely SGS Certified to EN50291-1:2018 - with external certification, you can rest easy in the knowledge that these alarms are top quality and are rigorously tested for effectiveness Helping you manage fire risks since 1963 - We want to make the world a safer place with effective fire safety equipment. Your peace of mind means a lot to our family business and our wonderful team