Features: It is a high-quality air quality detector, using good quality electrochemical detection module-, good accuracy, stable performance-, strong anti-interference ability, low consumption, long service life. Accurate detection of CO2-. Large screen displays electricity, CO2-, temperature and humidity. The 9-in-1 indoor monitor- has built-in professional detection sensors that accurately detect the current air quality index-, formaldehyde, organic pollutants, PM2.5, PM10-, carbon monoxide-, carbon dioxide concentration, temperature and humidity. Built-in multiple sensors, using semiconductor TVOC sensor, data refresh- in real-time. Adopt 3 kinds of selectable technology, infrared- detection technology/laser- detection technology/electrochemical detection technology. The air quality detector uses four stages- of AQI- - good mode- (0-100), light pollution mode- (100-150) and moderate pollution mode- (150-300). Heavy pollution mode- (Large than 300-). When the AQI- index- exceeds 100, the detector will sound an alarm. Built-in 1200mAh, 3.7V lithium- battery, charge 2-3 hours, available for 240-360 minutes. Specifications: Detection technology: semiconductor/infrared- laser- detection technology Display mode-: TFT- full color screen Operating voltage: 5V Sensor: PM2.5 sensor/conductor sensor Electrochemical sensor Product size: 70x90x35mm Detection range- PM2.5:0-999ug/m³ PM10-:0-999ug/m³ Formaldehyde: 0-9.999mg/m³ Organic pollutant TV0C: 0-9.999mg/m³ Carbon monoxide: 0-1000PPM Carbon dioxide: 0-5000PPM Temperature: 0-70°C Humidity: 0-99%RH Air Quality Index- AQ1:0-500 Package Includes: 1x Host 1x Manual 1x Data Cable 1x Certificate note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.