Built-in temperature compensation: It has output and PWM output at the same for time, which is easy to use Metal + The sensor is a high-performance sensor that combines mature absorption detection technology with precise optical circuit design and precise circuit design The MH-Z19C carbon dioxide sensor (hereinafter referred to as the sensor) is a general-purpose for smart small sensor that uses the principle of non-dispersive (NDIR) to detect the of CO2 in the air and other functions Size:2.5x2x2.3cm/0.98x0.78x0.90in, Manufacturer: UncleS