Multiple Detectable Gases - Selling's enhanced indoor air quality monitor is equipped with a built-in DART electrochemical sensor, which can accurately detect carbon dioxide (CO2), formaldehyde (HCHO), compounds volatile organic matter (TVOC) and particles (PM2.5/PM10) present in the air. This new model provides real-time data and averages, and it is recommended to focus on averages for each gas after testing for a sufficient period of time, as real-time data is unstable when monitoring at long term. Know your air - It is necessary for everyone to know the quality of the air where they live. This air monitor features a large, easy-to-read LCD digital color display. It provides a color indication of the overall ambient air quality, with three levels: good (green), slightly polluted (yellow) and severely polluted (red). You can have a direct view of the overall ambient air quality and track the average value of each gas to see which dangerous gases are in the air and take appropriate action. EASY TO USE - This air monitor is easy to use with the push of a function button and a full-page design that allows everyone to take all real-time measurements at the same time. It measures approximately 5.83 inches * 2.76 inches * 1.18 inches. The smart air quality monitor is easy to carry and can help us test our home, kitchen, bedroom, office, school, car, hotel, travel, camping, party, etc. . ......Especially with babies, children and pregnant women air quality lady. 3000mAh RECHARGEABLE BATTERY - BIAOLING air quality detector comes with a battery 3000mAh rechargeable lithium battery and USB cable, which can last up to 8-12 hours of continuous use. It is recommended to charge it for 6 hours before first use. Do not use it while charging or when the battery is low, as the data may not be accurate. The integrated low-power processing chip enables uninterrupted monitoring of air quality for a long time. It will always take care of your and your family's health. NOTE - Please note that this air quality controller is suitable for indoor places, please close the doors and windows before using. 'perform the test. We recommend using the monitor as an accessory and keeping an eye on the long-term averages (at least 60 minutes) and overall indication of ambient air quality. If you have any questions about the functionality of the monitor or need assistance recalibrating the sensor, please contact us by email.