Features 1、Alarm Mode: This CO2 monitor temperature humidity tester will sound an alarm when the indoor CO2 concentration is greater than 1000PPM. In alarm mode, the display will alert you to your surroundings by changing colour. 2、USB Charging: This air quality analyzer CO2 thermometer hygrometer is charged with a USB charging cable, it takes 3 hours for a full charge and can be used for about 7 hours when fully charged. 3、Compact And Portable: This air quality meter is small in size and light in weight, which is very convenient to carry and use, and it will not take up too much space at home, which makes it very convenient to use. 4、Multifunctional: This air quality tester is multifunctional, it monitors and displays the CO2 concentration per cubic metre in real time, as well as detecting and displaying the temperature and humidity of the environment in real time. 5、Wide Application: This CO2 detector has a wide range of applications and can be used for gas quality in bedroom, living room, kitchen, office, car, school, hotel, cellar, restaurant, campsite and other environments. It is suitable for home air testing, car air testing, growing room, mother and baby room air testing, public places testing and so on. Specification Item Type: Air Quality Detector Material: ABS Use: Real time monitoring and displaying of CO2 concentration per cubic meter, also detecting and displaying temperature and humidity of the environment. Intelligent color screen display, clear numbers, it can help you easily understand indoor air quality. CO2 Measurement Range: 400-6000PPM Battery: Lithium Battery x 1 (Included) Battery Capacity: 1500mAh Package List 1 x Air Quality Detector 1 x USB Charging Cable 1 x Manual