The combined FireAngel smoke & carbon monoxide alarm FA-SCB10-INT is an easy-to-install combination alarm and was developed to protect residents from fire and CO. It is ideal for protection in bedrooms and living rooms. The device has both smoke and carbon monoxide sensors to detect both hazards. It has clear indicators and warnings so you can see which danger is acute when the alarm sounds. The smoke & carbon monoxide detector has a sealed 3V lithium battery with a 10 year lifespan.