Features.1. Highly accurate indoor and outdoor air quality monitoring system with professional grade detection technology.2. Large LCD display, convenient and compatible for you to read at any time. Built-in high-capacity lithium battery.3. 3. Suitable for use in cars, living rooms, newly furnished and renovated houses, kitchens, bedrooms, offices, classrooms, outdoor environments, etc.4. 4. Highly compatible smart electrochemical independent sensor makes the data visible and touchable, slightly visual enough for peace of mind.5. 5. There is no need to keep an eye on the machine's value, as the alarm will sound as soon as the value exceeds the limit.6. The product can be attached to the wall with a double-sided sticker, or the product can be mounted on the wall pendant first and then hung on the pendant.Description.It is suitable for compatible use in cars, living rooms, newly furnished and decorated houses, kitchens, bedrooms, offices, classrooms, outdoor environments, etc.CO2. 400-5000ppmProduct size: 143 * 109 * 29mm / 5.6 * 4.3 * 1.1inPackage includes.1 * Air quality tester1 * USB cable1 * User manualCaution.1. Please allow 0-1 inch error, due to manual measurement. Thank you for your understanding and cooperation.2. 2. The calibration of monitors varies and the colour of the items shown in the photos may be slightly different from the real thing.