The Device id designed to continously monitor Carbon Monoxide concentration. With latest advanced electrical technology,a built-in-high-decibal-buzzer, the detector responds so quickly and is highely sensitive with stable work performance and very low falso alrm. After reaching the threshhold on the surrounding Carbon Monooxide concentration reaches the alarm value, it will eminentely sends out the beep audible and visual signal to alert the user to take the required measures.