Indoor and outdoor carbon dioxide detectors norm Display mode :LED digital display Battery capacity :1200mah Detection range :400~ 5000ppm Temperature range :32~158℉/0~70℃ Charging interface :USB-C 5V Product size :3.5*2.8*1.4in/9*7*3.5cm Weight :3.7oz/106g Infrared model: Infrared co2 detector adopts NDIR co2 sensor, which is an optical sensor. The infrared model works by testing the reception time from infrared to the other end to determine the amount of carbon dioxide. The infrared models do not use TVOC sensors, but instead use NDIR sensors. The accuracy of this model is very high. Therefore, the working principle of infrared is used in industrial carbon dioxide gas measurement equipment. Note: Please do not directly use a high concentration breathalyzer detector, this is not the correct way to use, and it is likely to damage the built-in sensor. 【Premium Quality CO2 Monitor】: Infrared and high performance chips are used inside the air quality monitor, display data in real time, more accurate and outstanding. The carbon dioxide detector is made of high-quality plastic materials, more durable and has a longer service life. 【Multifunctional CO2 Detector】: The CO2 monitor indoor can detect not only carbon dioxide concentration, but also temperature and humidity, intuitively understand the air quality of breathing. 【Large Capacity Battery】: CO2 carbon dioxide detectors built-in 1200mAh lithium battery, can be used for up to 8 hours after being fully charged. A USB C charging cable is included in the package to quickly charge the carbon dioxide meter. 【CO2 Meter with Color Screen】: The CO2 detector with intelligent color LED screen display and has clear numbers. The CO2 sensor display is easy to identify and read and has a protective effect on the eyes. 【Wide Application】: The indoor air quality monitor with compact design. The air monitor portable suitable for home, schools, greenhouses, warehouses, office buildings, hospitals, restaurants, shopping malls, factories, hotels, laboratories etc.