Features: 1. Selected quality sensor, high precision, anti-interference, with fast reaction speed. 2. Equipped with a large digital screen with backlight, you can clearly see the rest of electric 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. Application areas: agricultural planting, greenhouses, production warehouse, material processing, home interior, etc. 5. This product has LCD display, and the digital 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 screen with backlight, you can clearly see the rest of electric quantity, co2 value, temperature and humidity data. The color circle will be changed according to the detection data. Specifications: Scrren: LCD display CO2 Technology: Infrared (NDIR) Unit of temperature between Celcius and Fahrenheit Switch : CO2 ( 400-5000 ppm) Power supply: rechargeable Li-battery 1000mah includding USB charging cable Material: ABS Color:black Product size:70 x 80 x 35MM Weight: 150g Package Included: 1 pc x Air Quality Monitor Notes: 1. Please allow 0-1 inch error due to manual measurement. Thank you for your understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the actual object. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.