Features Work With Indoor Ventilation System: The indoor ventilation system can be intelligently adjusted according to the carbon dioxide concentration tested by the sensor, make the indoor air more comfortable and suitable for people to live. Accurate Measurement: This CO2 sensor can make an accurate measurement of the carbon dioxide content in the air, you can use it with confidence! Dual Use: This CO2 sensor can also be used to measure temperature and humidity, with carbon dioxide content and temperature measurement, very practical tool! Easy to Install: Comes with a compact size and a light weight as well, the easy installation can be quickly completed. Wide Application: This CO2 sensor can be used in home, botanical gardens, book stores, offices, buses, etc. To help measure the carbon dioxide content. Specification: Item Type: Gas Sensor Module Material: PCB Supply Voltage Range: 2.4-5.5 V Measuring Range: 400 to 5000ppm Accuracy: ± 40ppm Relative Humidity Measurement Range: 0 to 95% RH Typical Relative Humidity Accuracy: 6% RH Package List:1 x Gas Sensor Module 1 x Pin Header Package List 1 x Gas Sensor Module 1 x Pin Header