The quality of air is very vital to our health, so you need an air quality detector to test the quality of air in your life, not only CO2, but also can test temperature and humidity, come on and try it. You will not be disappointed with it. Features: This detector can be placed in children's room, bedroom, office, car and any place you want to place. This detector is suitable for indoor and outdoor air quality, muti-envornmental air quality monitoring for furniture, decorations, cars, and so on. The back of the product has an open hole design, which allows the sensor to fully contact the air, and can also dissipate heat, reducing false alarms caused by excessive temperature or insufficient contact with the outside air. Visual alarm system: There are indicators that change color according to different levels of carbon dioxide concentration, allowing you to have a more intuitive understanding of the detection results. The detector has a built-in temperature and humidity sensor, which can more comprehensively reflect the environmental conditions. The product is small and easy to carry, and can be taken anywhere you want. Specifications: Material: ABS Battery: 1 * lithium battery, 2400mAh Working temperature: 0~40 Working humidity: 20~80%RH Measuring temperature: -10~401 Measuring humidity: 20~80%5%)RH Input: 5V Item size: 83 * 83 * 32mm / 3.3 * 3.3 * 1.3in Item weight: 210g / 7.4ounce Package size: 150 * 83 * 46mm / 5.9 * 3.3 * 1.8in Package weight: 195g / 5.9ounce Packing List: 1 * USB Cable 1 * Air Quality Tester 1 * User Manual