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[Carbon Monoxide Alarm] This advanced carbon monoxide detector is equipped with a sensitivity electrochemical sensor to accurately and continuously monitor carbon monoxide levels. It is also equipped with an LED display for easy-to-read values (ppm). When the concentration exceeds a certain level, the alarm sounds and the red light flashes, and a buzzer sounds as a warning. You can quickly and clearly understand the concentration of PPM and take corresponding measures, which can effectively protect your personal and property safety. To ensure complete protection, be sure to place one on every level of your home and inside each bedroom.n Monoxide Detector