Features: [Real-Time Monitoring] Monitor five environment data including formaldehyde, VOC, CO2, temperature and humidity in real time, which can be checked clearly through the Tuya APP. [Intelligent Linkage] After setting up the automation mode in the APP, it can trigger linkage alarm when the indoor environment is abnormal and automatically open corresponding smart devices for optimization, such as air conditioner, humidifier, etc. [Easy Placement] Lightweight and portable, can be stick on the wall or put on the table and other places, meeting your different needs.