Advanced sensor: The -channel NDIR sensor provides high-precision detection and fast measurement response.Real-time monitoring of carbon dioxide: The device is designed to monitor and detect the concentration of carbon dioxide in real time. It can also measure the temperature and humidity of the room and the surrounding environment.Portable & light: This easy-to-carry quality meter can help monitor the quality in homes, and offices. 3 x AAA batteries(not included) can provide portable when not using USB for charging.Easy to use: With just one button, you can easily complete all operations, including turning on and off, switching between Fahrenheit and Celsius, and calibration.Auto-calibration function: The device will automatically calibrate itself within the first 24 hours after monitoring starts, and every 7 days thereafter. After calibration, the carbon dioxide value will be read as 400PPM.colour:WhiteMaterial:plasticPackage Contents:1 x CO2 Monitor1 x usb cableOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.