The liquid crystal display devices through the readings and “beep beep” sound alarm to detect carbon monoxide. “Beep beep” alarm function is similar to the Geiger counter ticking sound:
1, 200 PPM over the concentration of carbon monoxide, the “beep beep” sound alarm will continue along with the flashing red and blue
2, 35 PPM to 200 PPM between the concentration of carbon monoxide, “beep beep” sound alarm will continue along with the red flash.
0 percent to 99 percent relative humidity
5 percent or +10PPM