Nedis© combination smoke detectors with a modern design that detects both smoke and carbon monoxide (CO) to increase your safety. The smoke alarm ensures that you are alerted when fire smoke is detected or when carbon monoxide concentration is increased with a loud alarm of 85dB. It is equipped with a non-removable built-in lithium battery that has an estimated lifespan of up to 10 years and a sensor is included with an estimated lifespan of up to 10 years. The new generation of optical smoke alarms react even faster to fires, provide fewer false alarms and are very environmentally friendly. In addition, it has a high-quality electrochemical sensor that constantly measures the concentration of carbon monoxide in the air. Carbon monoxide is deadly, odorless, and invisible, making it impossible to detect without a detector. This dangerous gas is produced during incomplete combustion and can occur in the presence of a boiler, heat pump or chimney. It complies with the necessary EU standard EN 14604 and EN 50291.It is important to test the function regularly. To make it easier, the smoke alarm has a large, easy-to-use button on the front when you want to test the alarm.