Features [5 in 1 Detection] This air quality monitor offers comprehensive detection for CO2, TVOC, HCHO, humidity, and temperature, ensuring a thorough assessment of your indoor air quality. [Dual Channel Temperature Measurement] This air quality tester provides accurate temperature readings from two channels, offering precise monitoring of temperature differentials. [Enhanced Air Circulation] The air detector features openings on both sides and the back, promoting air convection for more accurate detection of air quality. [USB Charging] With USB charging capability, this air quality tester can be easily powered and conveniently operated, allowing for continuous monitoring without the need for frequent battery replacements. [Clear Display] The LCD TFT color screen provides a clear and intuitive display of all measurements, ensuring easy reading and understanding of air quality data. 1. [5 in 1 Detection] This air quality monitor offers comprehensive detection for CO2, TVOC, HCHO, humidity, and temperature, ensuring a thorough assessment of your indoor air quality. 2. [Dual Channel Temperature Measurement] This air quality tester provides accurate temperature readings from two channels, offering precise monitoring of temperature differentials. 3. [Enhanced Air Circulation] The air detector features openings on both sides and the back, promoting air convection for more accurate detection of air quality. 4. [USB Charging] With USB charging capability, this air quality tester can be easily powered and conveniently operated, allowing for continuous monitoring without the need for frequent battery replacements. 5. [Clear Display] The LCD TFT color screen provides a clear and intuitive display of all measurements, ensuring easy reading and understanding of air quality data. Spec: Item Type: Air Quality Monitor Material: ABS HCHO: 0-9.999mg/m3 TVOC: 0-9.999mg/m3 CO2: 400-5000ppm Temperature: 0-50℃ Humidity: 0-99%RH Display Mode: LCD TFT Color Screen Digital Display Working Voltage: 5V Charging Method: USB 500mA Type C Interface Charging Time: About 4h Battery Capacity: 1200mAh Polymer Lithium Battery x 1 (Built in) CO2 TVOC HCHO 400-600 Excellent (Qualified) 0-0.5 Excellent (Qualified) 0-0.04 Excellent (Qualified) 601-800 Good (Qualified) 0.501-0.6 Good (Qualified) 0.041-0.08 Good (Qualified) 801-1200 Slight Pollution 0.601-1.5 Slight Pollution 0.081-0.1 Slight Pollution 1201-1800 Moderate Pollution 1.501-3 Moderate Pollution 0.101-0.5 Moderate Pollution 1801-3000 Severe Pollution 3.001-6 Severe Pollution 0.501-1.0 Severe Pollution 3001-5000 Serious Pollution 6.001-12 Serious Pollution 1.001-1.999 Serious Pollution How to Use: Follow the instructions for operation. PackageList: 1 x Air Quality Monitor 1 x USB Package List 1 x Air Quality Monitor 1 x USB Cable 1 x User Manual