Features: Equipped with a highly responsive detection component, this monitor furnishes real time CO2 measurement to keep indoor air quality within safe ranges, ideal for homes and offices. The device simultaneously shows real time temperature, dampness, and CO2 readings on a clear, offering a full picture of your indoor environment. With its small 80x80mm ABS housing, this unit saves space and can be easily mounted in any room, allowing draft quality observation. If CO2 readings overcome safety thresholds, the built in alarm activates sound and light indicators, prompting quick ventilation for improved air. Store and review past air quality tendencies through the display or united application, helping monitor environmental changes over time in different indoor areas. Specifications: Component: ABS Size: Approx.80x80mm/3.14x3.14inch Suitable for homes, offices, schools and other locations, especially in poorly ventilated conditions to ensures new and healthy air. Package Includes: 1pcs Temperature Humidity Monitor note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you donot mind befores you order. 2.Due to the differences between different monitors, the picture may not reflect the actual color. Thanks for your understandings.