[Measurement Range] Temperature: 14°F ~ 140°F (-10 ~ 60℃); Humidity: 0 ~ 99%RH (non-condensation environment); CO2: 400 ~ 9999 ppm; PM2.5/PM10: 0 ~ 999 μg/m³; eTVOC: VOC Index 0 ~ 500, or 0.005 ~ 9.999 mg/m³; Noise: 36 ~ 95 dB. Previous page Fast · Accurate · Less drift in long-term use 2 Finishes: White and Black Superior texture, matching different decors. As Exquisite As a High-end Smartphone 4-inch · 254 ppi · Capacitive touchscreen · Auto-brightness Just Touch, As Intuitive As a Smartphone You can touch the numbers or slide to switch the interfaces, all the operations are smooth and easy. Multiple-side vents · Efficient · Accurate · Quiet The vent holes have more contact with air, and will not be blocked easily. Next page 1 Unparalleled Performance 2 Aluminium Outer Casing 3 "Retina" IPS Display 4 Touchscreen 5 Innovative Vent Design Pop-up PM Sensor, Replaceable The PM sensor is equipped with high-quality optical components and a magnetic levitation fan, enabling fast response and reliability, and providing accurate readings consistently. The PM sensor connects to the body through contact points, while the back cover is attached to the body with magnetic attraction, making it easy to replace. * Qingping Air Monitor 2 has built-in magnets, back cover has a built-in iron plate. Previous page Know the Air at a Glance Check the air data in real-time, the 7 readings refresh every second. Multi-colored Indicator Through the colors of the indicator, you will know the air quality immediately. Historical Data Tap the screen to view the historical data of 24 hours and 30 days. Outdoor Air Quality Weather · Air quality index · UV index · No-driving plates * Only available in some cities. Clock · Alarm Next page Previous page Works with Qingping+ App The product supports Wi-Fi, so you can check readings remotely and have the 90-day historical data exported. When there is no network connection, the sensors of this product still work. Rechargeable Lithium Battery, USB-C Charging Port You can plug it in USB power all the time. With an 1800mAh lithium battery built-in, the standby time reaches 4 hours. Upgradable, Keep Moving Forward Like a smartphone, you can upgrade the device to get new features and bug fixes. Next page Why does the screen turn off automatically? When the product is not plugged in, the screen will turn off automatically without any operations more than 5 minutes. You can change this in Settings > Screen. How to change to the English language on the device? Slide the screen to the page with a settings icon, tap the settings, tap the one with an earth icon, then you can choose English as the system language. How to switch the temperature unit? Find Settings icon on the screen and choose "Units", you can change the units of temperature.