Elro FV4310 Combi Detector 4-pack

The Elro FV4310 4-pack detects fires and also measures carbon monoxide. As a result, you're warned in time in case of a fire and you prevent carbon monoxide poisoning. The combi detector has a built-in battery with a 10-year lifespan. This means you almost never have to replace the battery. The battery indicator also shows if the battery is almost empty. Be sure to regularly test the smoke detector with the test button. That way, you'll be sure the FV4310 is still functioning properly.