Feature 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).Item Type:CO2 MonitorMaterial: Plastic, GlassWeight: Approx. 473g / 16.7ozSize: Approx. 270 x 90 x 35mm / 10.6 x 3.5 x 1.4inWorking Voltage: 5VMaximum Power Charging Current: 1000mACO2 Detection Range: 400 to 5000PPMCO2C Test Accuracy: 400 to 1000ppm, Deviation 50ppm Above 1000ppm, Deviation 5%Temperature Measurement Range: Minus10C to 50CTemperature Accuracy: 1.0C (0C to 40C)Humidity Test Range: 20 to 85%RHHumidity Accuracy: 5%Battery Type: 18650 Lithium Battery (Ship with Inbuilt Battery)Battery Capacity: 1200mAhFull Power Working Time: 6 to 7hCharging Method: USB ChargingScope of Application: Home, Restaurants, Educational Institutions, Fitness Clubs, Schools, Libraries, Etc.Note: When Using for the First Time, Please Turn on the Device and Keep It for More Than 24 Hours, the Device Will Automatically Calibrate. (When calibrating, do not power off and restart halfway through) .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }Package List1 x Air Quality Monitor(Ship with Inbuilt Battery)1 x User Manual1 x USB Charging Cable2 x Screws2 x Expansion TubesNote When Using for the First Time, Please Turn on the Device and Keep It for More Than 24 Hours, the Device Will Automatically Calibrate. (When calibrating, do not power off and restart halfway through)