With help of the CO2 detector, it will alarm when the detected CO2 concentration is beyond the safe value you customized to monitor house security for you timely. And more, this product also can be used to measure humidity and temperature in real-time. Full-color display and large screen design ensures its super easy readings with LED digital display for eye protection. And more, it also built-in large capacity rechargeable battery whose standby up to 40 hours. It can be charged by Type-C. It is constructed of PC material. Compared to other similar products, our CO2 detector is functional with 3 stages of CO2 concentration-normal stage (400-700 ppm), warning stage (700-1500 ppm), and dangerous stage (1500-5000 ppm). Besides, this air tester is designed with calibration function for more accurate monitor. The length of this product is 9.8cm, the width is 9cm and the height is 4cm. Equipped with a convenient hanging hole, our CO2 detector can be hung on any storage hook. You can transfer the Temp. valve between Celsius and Fahrenheit easily in APP or directly via-the button on the detector. This product is perfectly suitable for school, home, household, office and more. Add smart scenes in the APP for automating other smart home devices with the CO2 detector under CO2 concentration, temperature and humidity value, such as automatically open your window when the detected CO2 concentration is beyond the safe value, or turn on the AC when the temperature is too high. Item Name: Carbon Dioxide Meter Material: PC Carbon Dioxide Range: 400-5000 ppm Minus or Plus (50ppm Plus 5 Percent Temperature Range: Minus 10 Degree Celsius-40 Celsius (Minus or Plus 2 Celsius) Humidity Range: 20-80 Percent RH (Minus or Plus 5 Percent RH) Power Supply: Built-in Lithium Battery Battery Capacity: 2400mAh Wireless Connection: 2.4GHz Wi-Fi Input: 5 V/1 A Features: Easy to Read, Large Screen, Smart Size Details: 9.8cm x 9cm x 4cm/3.86" x 3.54" x 1.57" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Carbon Dioxide Meter 1 x User Manual 1 x Charging Cable