[Safe and Reliable] The carbon monoxide alarm complies with EN 50291 and uses a highly sensitive electrochemical sensor with a lifespan of up to 5 years. It accurately and quickly detects carbon monoxide leaks, protecting you from danger while minimizing false alarms. [Our CO alarm monitors the carbon monoxide concentration in the air in real time. When dangerous levels of carbon monoxide are detected, the red LED flashes and the buzzer emits a continuous 85 dB alarm to protect your family's life and the safety of your property. [Easy to Install] Simply unscrew the back plate of the detector, screw it to the wall or ceiling, insert 3 x 1.5V AA batteries (NOT INCLUDED), place the detector on the back plate, and rotate it into position. When the batteries are nearly depleted, an audible warning signal will sound. You can then easily remove the detector from the rear license plate and replace it with new batteries. [Digital LCD Screen] The screen displays real-time CO values within a