Feature: 1. High Quality Sensors: Equipped with a high-quality semiconductor TVOC sensor and an electrochemical detection module, our air quality monitor delivers precise readings, robust performance, excellent resistance to interference, efficient power usage, and a lengthy lifespan. 2. Multifunctional Detection: Accurately detecting a range of environmental factors such as time, AQI, HCHO, TVOC, PM2.5, PM10, CO, CO2, temperature, humidity, APP monitoring and curve function, our portable CO2 monitor offers a comprehensive and accurate indoor air quality assessment. 3. Clear Display: Showcasing a large screen that ensures clear readings, our CO2 detector displays time, date, along with various environmental parameters, providing a comprehensive real-time snapshot of your indoor conditions. 4. Smart APP Monitoring: With the smart APP, you can monitor real-time air quality data and review historical records with our temperature humidity meter, tracking environmental changes over time and taking necessary action for optimal air quality. 5. Curve Recording Function: You can press the button to set Wifi calibration with TVOC, PM particulate matter, and view the historical recording curve of the 6 indicators TVOC/HCHO/PM2.5/PM10/CO/CO2. Specification: Specifications: Color: Black / White (Optional) Model: ZN-MT28 Material: ABS Operating Voltage: 5V Charging Method: USB 500mA Type-C port Charging Time: About 4h Standby Time: About 300-360 minutes (built-in multiple sensors, power consumption) Battery Capacity: 1200mAh lithium battery Item Size: 90 * 70 * 35mm / 3.54 * 2.76 * 1.38in Item Weight: 124g / 4.37oz Package Weight: 180g / 6.35oz Package Size: 14.1 * 9.8 * 4.8cm / 5.55 * 3.86 * 1.89in Package List: Package List: 1 * 12-in-1 Air Quality Monitor 1 * Charging Cable 1 * Packaging Box 1 * User Manual (English)