About this item Real-time detection: CO2 monitor uses a dual-channel NDIR sensor, which can not only detect the content of carbon dioxide in the air in real time, but also display the temperature and humidity of the surrounding environment. Click the + button to switch the temperature unit Smart Alarm: Double-click the power button to set the alarm value. After setting the alarm value, click the power button to save the alarm value. When the value of CO2 reaches the set value, the CO2 monitor will send out an alarm. Long pre the + button to turn the alarm on or off Wide Range of Applications:The CO2 detector has a small size and is convenient to carry around. It can be placed indoors, offices, clarooms, hospitals and other places. There is a small hole on the back of the CO2 detector for easy hanging Built-in Rechargeable Battery:The CO2 meter has a built-in 2400mAh rechargeable battery, which can be used continuously for more than 18 hours after a full charge. Click the "-" button to turn on or off the backlight and extend the use time Accurate Measurement:The dual channels used in the CO2 monitor can make the air in the equipment more circulate, and the NDIR sensor can prevent the cro-contamination of CO2 and other gases, so as to achieve a more accurate measurement Carbon dioxide is a common compound in the air. In a closed room, human breathing will cause the concentration of carbon dioxide to rise continuously. When the concentration reaches a certain level, people will feel sleepy Small The air quality monitor is small in size, does not take up space, and is convenient to take to any place you want Temperature and Humidity Display The temperature and humidity of the surrounding environment will be displayed on the screen of the CO2 meter. Click the "+" button to convert the temperature unit NDIR Sensor The NDIR sensor in the co2 detector can effectively measure the content of carbon dioxide in the air. The dual-channel design makes the measurement faster and more accurate Hangable There is a small hole on the back of the carbon dioxide detector, which is convenient for hanging on the wall for viewing, or it can be placed in other place Turn on/off the Backlight According to your needs, click the "-" button to turn on/off the backlight, thereby prolonging the use time of the co2 monitor Chargable The co2 monitor has a built-in 2400mAh battery, and a USB charging cable is included in the package, which can be used for more than 18 hours after being fully charged