Features: 100% brand new and high quality The smart bellows is a smart device for remote monitoring of the home air environment. It can also detect 5 environmental parameters such as formaldehyde, toxic gas VOC, CO2, temperature, and humidity. When the environmental parameters exceed the standard, Tuya smart home air conditioner, fresh air fan, humidifier, air purification The device is optimized for the home environment. Smart bellows detection range: formaldehyde, VOC gas, CO2, temperature, humidity. After pairing with the APP, you can link various smart home products. When it detects that the formaldehyde/VOC exceeds the limit, the smart air purifier will automatically turn on. When the carbon dioxide exceeds the limit, the smart fresh air blower will automatically turn on; when the temperature is abnormal, the air conditioner temperature will be automatically adjusted. When the humidity is too low or too high, the smart humidifier will automatically turn on/off; when it detects that a certain parameter exceeds the standard, it will send a message to alarm (the above smart linkage function needs to be used with smart home products). Package Includes: 1x Smart Air Box Carbon Dioxide Detector Specifications: Material:PVC Size:Approx.9x9cm/3.54x3.54inches Color:White Range: Formaldehyde: 0-10.0 (mg/m3) VOC: 0-99.9 (ppm) Carbon dioxide: 0-1000 (ppm) Temperature: 0-60 () Humidity: 0-95 (%) note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.