【Monitor Harmful Substances Constantly】There may be a lot of harmful substances like formaldehyde floating in the room newly renovated. We must use an air quality monitor to keep monitoring their densities until the room is available to live in. Try to use this air quality detector in your home to guard your health. 【Prevent High Density of CO2】You are able to know the real-time density of CO2 in your home by putting it on the table. When you are having an indoor barbecue or getting warm by a fireside, it can remind you of the CO2 density to avoid hypoxia caused by high-density CO2. 【Considerate Real-time AQI】It shows time, the indexes of PM2.5 and PM10, AQI, temperature, and humidity on the display. You could know all the basic weather statistics easily. Remember to wear a mask if the AQI is bad when you are going to go outside. 【Long Continuous Working Time】The air detector can work continuously for about 480 minutes thanks to the large-capacity built-in lithium cell which has a long lifespan. And the measuring range of CO2 is 400-5000PPM. 【Clear LCD Display & Portable Design】All readings on the display can be shown clearly. It can work once the power is connected without assembly. Made out of PVC material, it is very lightweight and sturdy. And this compact air detector measures 7.5 x 3.1 x 2.0 inches.