ALARM SYSTEM Wifi CO2 detector is designed with three concentration levels: normal (400-700 ppm), warning (700-1500 ppm), and danger (1500-5000 ppm). It will automatically sound an alarm once the CO2 concentration exceeds 1500 ppm, and you can also set different alarm ranges as needed. You will receive an immediate alarm if the carbon dioxide concentration exceeds the preset range.
RECHARGEABLE & WALL AMOUNTPpm CO2 detector has a built-in 2400mAh capacity rechargeable battery. You can hang the indoor CO2 monitor to the wall for easy viewing, also you can place the CO2 air quality monitor on your office or living room desk.