A 5-in-1 Multifunction Air Monitor Air Monitor Lite tests 5 major factors of the indoor air quality: PM2.5 (the result of secondhand smoke), PM10, CO2, temperature and humidity. By knowing the real-time air quality, you can turn on the air purifier or open the window when needed.High Accuracy and Fast RespondingInside the air monitor, there are reliable, fast responding and stable sensors from top level sensor manufacturers. The 5 readings refresh ever second. The air inlet grille design at the back enables sufficient contact between the sensors and the air. The product is NOT waterproof/dustproof, please do not place this product in environment with humidity higher than 90% for long term use.Works with Apple HomeKit and + appAs this is a Wi-Fi device (2.4GHz Wi-Fi ONLY), you can check data remotely/export historical data on + app (available on App Store/Google Play). For Apple Home app users, check the 5 metrics remotely or set automation with an Apple home hub; for automation on temperature/humidity, the iPhone needs to be upgraded to iOS 15.1 or later, and the hub should be upgraded to the latest version.Clear OLED Display and Sensitive Touch BarPixel style UI design shows on a clear OLED screen, enables bigger visible angle and more fun. Through the multi-colored indicator, you will know the air quality, the temperature and the humidity level of your room, with a glance from a distance. You may tap or slide the touch bar on the top to switch the readings as smoothly as to operate a touch screen.Rechargeable Lithium Battery with 7-hour Battery LifeThe built-in 2000mAh Lithium battery is with up to 7 hours battery life. We recommend plugging it into power all the time. There is a USB-C cable supplied. IMPORTANT: When running on battery, the default setting is to turn off the product automatically after a few minutes, you can change settings in + app to let it stay on without power supply if needed.