This mini air quality meter is as small as the palm of your hand and can test 5 indoor air quality levels - formaldehyde, VOC, CO2, temperature and RH percent . Connect it to 2.4GHz Wi-Fi, and you can check the current air quality on your phone through the smart app. If any value is out of the normal range, the device will send you a real-time alert prompt. It may be small, but it's satisfying. Product Features: Accurately measure and monitor indoor HCHO (formaldehyde), VOC (volatile organic compounds), CO2 (carbon dioxide), temperature and humidity levels. Helps you check the current air quality in your home remotely, just check it on your phone through the app. Send real-time alert prompts when the air quality is out of the normal range. Able to connect with other smart home appliances such as air conditioners, air purifiers, humidifiers, etc. to create a smart home. The historical data graph clearly shows the changes in air quality over the day, month and year. Simple setup requires an available Wi-Fi 2.4 GHz frequency signal and is in an Internet connection state. The USB-powered air quality detector can be powered by any USB device and is easy to carry. Specifications: Network version: WiFi or Zigbee (optional) Material: PVC Color: White Input: 5V, 1A Formaldehyde measurement range: 0-10 mg or m³ VOC measurement range: 0-99.9 ppm CO2 measurement range: 0-1000 ppm Temperature measurement range: 0-60℃ Humidity measurement range: 0-95 percent Item size: 9x9x3.5cm or 3.54x3.54x1.37 inches Item weight: 60g or 2.11oz Packing size: 9.5x9.5x4cm or 3.74x3.74x1.57 inches Packing weight: 92g or 3.24oz Packing list: 1 x Air quality monitor 1 x USB data cable 1 x Eject pin 1 x User manual (English) Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.