and High Quality! This product needs to be used with ZigBee 3.0 ! Smart box is the home of intelligent device for remote monitoring of environment,It can also detect formaldehyde, VOC of poisonous gas, CO2, temperature, humidity and so on 5 kinds of environmental parameters,In environmental parameters exceed bid automatically when the graffiti conditioning, new fan, humidifier, purifier on household environment optimization. The detection range of the smart box: formaldehyde, VOC gas, CO2, temperature, humidity Examination range: Formaldehyde: 0-10.0 (mg/) VOC: 0-99.9 (ppm) Carbon dioxide: 0-1000 (ppm) Temperature: 0-60 (℃) Humidity: 0-95 (%) After being paired to the APP, it can be linked with various products. For example, when detecting excessive formaldehyde/VOC, the smart purifier is automatically turned on; when the carbon dioxide is exceeded, the smart fan is automatically turned on; when the temperature is abnormal, the conditioner temperature is automatically adjusted ; When the humidity is too low or too high, the smart humidifier will be turned on/off automatically; when a certain parameter is detected to exceed the standard, a message will be sent to the alarm (the above smart linkage function needs to be matched with the product) Working temperature: -20--85℃ Working current: 10-496ma supply mode: USB 5V/1A Working voltage (rated): 4.8-12V Communication protocol: ZigBee3.0 Size: 90x90x35mm color:White Material:abs Package Contents: 1 x smart box 1 x English manual 1 x Card pin 1 x USB supply cable Only the above package content, other products are not included. Note: Light reflection and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.