Product Description Tuya Smart Wifi Air Quality Tester Temperature and Humidity CO2 Tester Monitor LED Color Display Screen Air Quality Sensor 1. Small size, light weight, easy to use and carry.2. Equipped with high quality temperature sensor and humidity sensor do fast and accurate detection.3. The 2,8 inch LCD screen with backlight can clearly display the current CO2, temperature and humidity values. The colored circle will change depending on the current CO2.4 value. Simple operation, no need for calibration after commissioning, automatic operation and detection.5 Widely used in home use, educational institutions, agricultural planting, greenhouse planting, warehouse operations, material processing, etc. Tuya Smart Wifi Air Quality Tester CO2 Temperature and Humidity Tester Monitor LED Color Display Air Quality Sensor This product does not include a built-in lithium battery and must be connected do power source throughout use. Distinctive features: 1. Small size, light weight, easy to use and carry. 2. Equipped with high quality temperature sensor and humidity sensor do fast and precise detection. 3. The 2,8 inch backlight LCD screen can clearly display the current CO2, temperature and humidity value. Colored circles will change depending on the current CO2 value. 4. Easy operation, no need to measure after start-up, automatic operation and detection. 5. Widely used in educational institutions do home use planting agricultural planting greenhouse processing operations of storage materials. The package includes: 1 * Tuya Smart Wifi Air Quality Tester 1*USB cable 1 * Instructions