Features: Strong anti-interference ability, low consumption and long service life. The product does-not need calibration, it can-be measured immediately when it is turned on, and it can accurately detect carbon dioxide. Different-colors correspond to different air-quality, suitable for offices, homes and other-occasions. Hundreds of ventilation holes on the back of the chassis-can not only accelerate the-convection between the air and the-machine for effective detection, but also provide good heat dissipation. Widely used in: agricultural-planting, greenhouse-vegetables, production warehouse, material processing, home interior. Package Includes: 1 Set Air-Quality Monitor Specifications: Material:ABS Size:As Picture Shown note: .Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. .Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thanks for your understandings.