Please note: the physical slightly color difference or difference, does not affect the use, please do not mind, thank you! [Comprehensive Air Quality Test]: This 15-in-1 air quality tester integrates multiple test functions for measuring , CO, CO2, PM0.3, PM1.0, PM2.5, PM10, formaldehyde, TVOC, temperature, humidity, as well as time display, alarm, timer and countdown timer functions, providing a complete solution for your air quality needs. [Personalized Settings & Historical Data Checking]: Supporting customizes alarm limits, sets sleep modes, and effortlessly explores detailed historical data on air parameters by day, month, or year. The app also boasts a user-friendly interface with options for temperature unit switching and versatile timer settings, ensuring a personalized and convenient experience tailored to your needs. [Warning & Visual Alert]: After connecting to WiFi, users can set the alarm value according to their needs. Once the measured data exceeds the standard, the device immediately sends out three emergency beeping alarms, and the interface color changes with the air quality (green-nice, orange-warning, red-bad), intuitive warnings to immediate response. [Intelligent Linkage Control]: Use high-end infrared and laser sensors to measurement accuracy. It can link with the smartplug to control external devices. For example, you can set the exhaust fan to turn on when the CO2 concentration exceeds 1500ppm and turn off when it drops below 800ppm, saving electricity. Applicable to families, schools, hospitals, children's rooms, hotels, restaurants, cars, and other places. Colour:White Material:plastic Package Contents: 1 x Air Quality Tester 1 x Cable 1 x Instructions in Chinese and English Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.