1Infrared Sensor: The CO2 monitor uses a far infrared air sensor, which can measure three parameters more accurately, CO2, temperature and humidity. One thing is multi purpose and can be used as a high definition makeup mirror for artwork. 2Adjustable Brightness: You can adjust the brightness through the buttons on the product. There are 6 different levels of brightness, ensuring that you can see the readings even under the brightness. 34 Different Expressions: 4 Different cute expressions correspond to different CO2 concentration levels, and the air quality and temperature and humidity levels are indicated by color and expression grading. 4Good Heat Dissipation: Sufficient ventilation holes not only accelerate the convection between the air and the machine for effective detection, but also provide good heat dissipation. 5Alarm Function: CO2 monitor has an alarm function, and you can manually set the alarm value yourself. When the alarm value is reached, the device will beep (the default alarm value is 1000ppm).1 x Air Quality Monitor(Ship with Inbuilt Battery)1 x User Manual1 x USB Charging Cable2 x Screws2 x Expansion Tubes