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 or m3) VOC: 0-99.9 (ppm) Carbon dioxide: 0-1000 (ppm) Temperature: 0-60 () Humidity: 0-95 ( percent ) After being paired to the APP, it can be linked with various products. For example, when detecting excessive formaldehyde or 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 or 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 or 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 cause the color of the item in the picture a little different from the real thing. The measurement allowed error is 1-3cm.