Advantages: 1.3-in-1: Can function as a carbon dioxide concentration detection, thermometer and hygrometer at the same time. 2.Battery power supply: built-in 1200mAh lithium battery, use TYPE-C charging cable to charge it. 3.Color screen: the current carbon dioxide data, temperature and humidity. The colored ring will change according to the carbon dioxide content. 4.Easy to operate: long press the "on-off" key for 3 seconds on and off. It will detect the carbon dioxide2 automatically. 5.Compact and portable: can take in the kitchen, living room, bedroom, or when going out. 6.Equipped with a large screen, different font colors display different air quality, green 0-799ppm, yellow 800-1199ppm,Orange 1200-1599ppm,red 1600-1999ppm. 7.Hundreds of ventilation holes at the rear not only accelerate the convection between the air and the machine, thereby realizing effective detection, but also provide a good heat dissipation effect.Specifications:Screen type: LCDCarbon dioxide Detection Range: 400-5000PPMCarbon dioxide Detection Sensitivity: 1PPMTemp Measuring Range: 0 ~ 50 CTemp Measurement Accuracy: 1 CHumidity Measurement Range: 0% ~ 99% RHHumidity measurement accuracy: 2% RHCharging Modes: TYPE-C 5VBattery: Built-in lithium battery 1200mAhSize: 9 x 7 x 3cm / 3.54 x 2.75 x 1.18inchScreen: 2.8 inchColors: White/BlackPackage Included:1 X Carbon Dioxide Detector1 X Data Cable1 X ManualNotes: 1.Please allow 0-1 inch error due to manual measurement. Thanks for your understanding. 2.Monitors are not calibrated same, item color displayed in photos may be showing slightly different from real object. Our products are made with the splendid quality materials and are designed to provide you with the best possible user experience.