Features: 1. Selected quality sensor, high precision, anti-interference, with fast reaction speed. 2. Equipped with a large digital display with backlight, you can clearly see the remaining electrical quantity, co2 value, temperature and humidity data. 3. This product is equipped with a CO2 alarm function, which will alarm when the CO2 concentration is abnormal. 4. Areas of application: agricultural planting, greenhouse plants, production warehouse, material processing, domestic interior, etc. 5. This product has LCD display, and the numerical display is very clear and intuitive. Description: This is a type of air quality detector, which can be used to test temperature and humidity and co2 concentration. Equipped with a large digital display with backlight, you can clearly see the remaining electrical quantity, co2 value, temperature and humidity data. The color circle will be changed according to the detection data. Specifications: Scrren:LCD Screen display CO2 Technology : infrared ( NDIR) Temperature unit between Celcius and Fahrenheit Switch Detection range: CO2 ( 400-5000 ppm) Power supply：rechargeable Li-battery 1000mah includding USB Chargeing cable Material: ABS Color:Black Product size:70*80*35MM Weight:150g Package Included: 1 pc*Air Quality Monitor Notes: 1. Please allow 0-1 inch error due to manual measurement. Thanks for your understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from real object.