CO detectors warn you of rising carbon monoxide (CO) levels, an invisible, odorless, and tasteless gas. CO blocks the blood's ability to absorb oxygen, leading to unconsciousness in a very short time and death by suffocation within minutes. Features a functional display, electrochemical sensor, audible alarm with an additional blinking LED. Includes 2x AA batteries. Alarm for low battery level and visual indicator. Operating conditions: -10 °C to 40 °C temperature, up to 95% humidity. Suitable for wall or ceiling mounting, includes mounting materials. IP20: for indoor use.