Features: Module double channel sensor has the characteristics of high precisions measurement, strong stability and fast response, and can accurately monitor the CO2 concentration in the air. The sensor uses advanced absorption technology to measure CO2 concentrations in both indoor and outdoor environments and outputs the data through a digital port. At the same time, it also has low power consumption, small size, easy to install and other characteristics. It is suitable for places where air quality needs to be monitored and controlled, such as offices, schools, hospitals, factory etc. Both individual and business users can use the sensor to improve indoor air quality. The sensor can be widely used in air conditioning system, homes and other fields to help users understand the indoor CO2 concentration, timely ventilation or other control measures to provide a comfortable and healthy indoor environment. Specifications: Material: Plastic Range: 400ppm-5000ppm Operating Temperature: 0 to 50℃ Operating Humidity: 0-90%RH Non Condensed Power Supply: 4.2V-5.5V Port: Uart Period: 1004ms, Pulse: 2-1002ms(0-5000ppm) Size: Approx. 35.6x21.2x12.7mm/1.40x0.83x0.5in Package Size: Approx. 46x34x19mm/1.81x1.34x0.75in Package Includes: 1x Air Quality Detection Sensor 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.