- 9 in 1 multifunctional air quality detector monitors CO2, CO, TVOC, HCHO, PM2.5/PM10, temperature and relative humidity in real time, helping you identify air quality issues quickly. - Large digital backlit display provides clear readings and supports alarm alerts when any value goes outside set thresholds. - Sensor system includes a semiconductor gas sensor, PM2.5 sensor and electrochemical sensor with a performance chip for more accurate, stable detection and faster response. - Built-in 2000 mAh battery with low power consumption delivers long operation between charges. - Compact handheld design with simple controls for convenient use in home, office, or classroom. - Home: monitor nursery or living spaces to protect health and comfort. - Office or classroom: maintain healthy indoor air to support productivity. - Renovation or cleaning: spot-check for pollutants after painting or cleaning activities.