Product Description Advanced technology, simple design, beautiful and practical, our indoor air quality testing can accurately detect CO2, HCHO, AQI and TVOC, allowing you to know which gases in the air are unsafe at any time. Take the appropriate steps to take beter care of your health and that of your family. Product name: air quality monitor Product material: ABS. Product size: 120x63x26mm. Working time: 180-240 minutes Charging time: 3 hours Response time: 2 minutes to warm up after power on Battery capacity: 850mAh Product color: black. Product quantity: 1 piece. Features: 1. The air quality tester for home is made of high-quality ABS material, which is lightweight, durable and not easy to deform. It can be used for a long time. The corresponding data will be displayed after 2 minutes after powering on. 2. The portable CO2 monitor has a high-definition LED display with backlight design, making it easy to identify and read. The screen displays the battery level, allowing you to monitor it in real time. 3. The air quality detector is equipped with a fast-response, sensitive, high-performance chip with strong anti-interference and low power consumption, which ensures measurement accuracy.