USB rechargeable CO2 detector, indoor air quality monitor, thermometer and hygrometer for home, school and office

Real-time monitoring alerts - Stay informed with the carbon dioxide monitor that detects CO2 concentrations in real time and triggers four alert lights when levels exceed 1999.The smart color display ensures easy reading, with a flashing red light and an audible alarm for concentrations between 1600 and 1999. Easy to read - The CO2 meter uses a smart color display with clear numbers.When the CO2 concentration is between 1600 and 1999, the red light flashes and triggers an alarm.Enjoy a smart and intuitive interface with our air quality tester, featuring a multi-color LED indicator for quick ventilation assessment: green (good), orange (average), and red (poor). TVOC Sensor - The CO2 detector with a TVOC sensor is designed to monitor CO2 levels, temperature, and humidity to maintain a healthy environment.USB charging is highly recommended. Versatile Use: This portable, compact CO2 detector is ideal for monitoring air quality in homes, schools, office buildings, hospitals, restaurants, shopping malls, factories, hotels, laboratories, and other locations. 5-in-1 Versatile Design: This robust CO2 detector provides comprehensive monitoring, measuring CO2, TVOC, temperature, PM2.5, and humidity levels.Choose the display in Fahrenheit or Celsius according to your preference.