Several detectable gases: For everyone, it is necessary to know the air quality where you live. The enhanced indoor air quality monitor integrates with a DART electrochemical sensor to accurately detect carbon dioxide (CO2), formaldehyde (HCHO), and volatile organic compounds (TVOC) in the air. These readings involve the detection of toluene, harmful chemicals, and air pollutants such as carbon dioxide.<br> <br> High Definition LED Screen Digital Display: After turning on and warming up the air detector for two minutes, the LED screen clearly displays five indicators of CO, CO2, HCHO, TVOC and AQI in real time. The monitor battery displays three color states: green, orange, and red. Green indicates sufficient power. Orange means the battery is low. Red indicates low battery (please charge in time).<br> <br> Ease of use: The air quality monitor has three easy-to-use buttons. ON-OFF: Press and hold for 3 seconds to turn on or off. Again: press and hold for 3 seconds to reset the instrument calibration. RESET: Press and hold for 3 seconds to clear data and re-detect.<br> <br> Portable: This air quality meter is compact and easy to carry, size: 4.8 x 2.5 x 1.1 inches. The bottom angle of the instrument is 15 degrees. This air quality tester is perfect for living rooms, bedrooms, cars, offices, schools and other indoor situations. Especially where there are babies, children, the elderly and pregnant women.<br> <br> PLEASE NOTE: Please note that this air quality monitor is intended for indoor use of a house, close the doors and windows before the test. We recommend that you use the monitor as a fixed unit and pay attention to long-term averages (at least 60 minutes) and an overall indication of environmental quality. Make the value clearer and the value complete. It will display after 10 minutes of power on.