1. 15 in 1 functions: time, temperature, humidity, carbon dioxide, carbon monoxide, TVOC, HCHO, PM2.5, PM10, PM1.0, PM0.3, timer, timer, alarm clock; 2.8-inch TFT color display, allowing for easy viewing at a glance; real-time display of 11 data items, including 10 specific parameters and 1 comprehensive data item. 2. Color grading instructions - not only display the specific value of each parameter but also help quickly understand indoor environmental conditions through different colors; values and three-color indication can help understand the comprehensive environmental conditions. 11 real-time values can be viewed, with 10 items (temperature, humidity, CO, CO2, HCHO, TVOC, PM particulate matter 0.3, 2.5, 1.0, 10) updating in real-time per second; 1 integrated value. 3. Composite index view: intelligently calculate the air quality composite index based on each item's value, allowing environmental conditions to be seen at a glance. 4. Color grading display: quickly understand indoor environmental conditions through the color change of each value on the screen. 5. Wi-Fi connection: automatically synchronize time and date. 6. Note: slight physical color differences or variations do not affect use; please do not mind, thank you! 7. 3 alarms can be set to cope with daily matter reminders. 8. Alarm clock reminder. 9. Alarm duration is 30 seconds and can be adjusted via the APP. 10. Timer can be set to countdown mode to cope with daily matter reminders. 11. Alarm clock reminder time is 30 seconds and can be adjusted via the APP. 12. Timer can be set to count-up mode to cope with daily matter reminders. 13. With battery. 14. Color: Black. 15. Material: plastic. 16. Package Contents: 1 x Air Quality Tester, 1 x Cable. Only the above package contents are included; other products are not included. 17. Note: Light reflection and different displays may cause the color of the item in the picture to be slightly different from the actual product.