[5 in 1 Function]: The multi-function air quality monitor takes care of and can be widely used , office, classroom, hotel, gym, greenhouse, warehouse, etc.[LCD Color Screen]: Displays CO2, CO2 index, HCHO (formaldehyde), TVOC, temperature, humidity and battery level. LCD color digital display for easy and clear reading even in dark environment.[Carbon Dioxide Tester]: Adopt semiconductor sensor, air convection detection, quickly and accurately detect CO2 concentration in living environment.[4-color indicator and alarm buzzer]: 0-799PPM (Green), 800-1199PPM (Yellow), 1200-1599PPM (Orange), 1600PPM and more (Red). The buzzer will alarm when the CO2 concentration is higher than 1500PPM.[Rechargeable Design]: Built-in 1200mAh rechargeable lithium battery for strong endurance. With USB Type-C interface for fast charging via power adapter, power bank, laptop, etc.Screen: LCD Digital Color ScreenVoltage: 5V DCDetection Principle: Semiconductor SensorCO2 Detection Range: 400-5000PPMCO2 Detection Sensitivity: 1PPMHCHO Detection Range: 0-0.6mg/m3TVOC Detection Range: 0-2.0mg/m3Temperature Measurement Range: 0-50Temperature Measurement Accuracy: 1Humidity Measurement Range: 0~99% RHHumidity Measurement Accuracy: 2% RHCharging Port: Type-C, 500mABuilt-in Battery: 3.7V 1200mAh Lithium Batterysize:90x70x35mmMaterial:ABScolour:BlackPackage Contents:1 * Air Quality Analyzer1 * USB Cable1 * English manual