Feature:1. High Accuracy: This air quality monitor is equipped with a high accuracy sensor to ensure accurate monitoring of HCHO and CO2 levels in the air.2. Color Screen Design: This air quality tester is designed with a color screen that intuitively displays the test results, making it easy for users to understand indoor air quality and take immediate action.3. Rechargeable Design: This CO2 detector adopts rechargeable design, which is easy to carry and use, no need to replace batteries frequently, environmental protection.4. Multifunctional: This gas monitor alarm detector is multifunctional and can be used to detect a wide range of gases, such as HCHO, TOVC, CO2.5. Wide Application: This portable CO2 monitor has a wide range of applications and can be used at home, schools, factories, workshops and so on.Specification:Item Type: Air Quality Monitor Material: ABS Battery Type: Lithium Battery ( Shippen With Built In Battery )Battery Model: 3.7VBattery Capacity: 1000mAhDetection Type: HCHO, TOVC, CO2 in the airDisplay: LCD 2.8in Segment ScreenAtmospheric Pressure: 86Kpa-100KpaRelative Humidity: 20%-85%Storage Temperature: -20-50.Package List:1 x Air Quality Monitor1 x USB Cable