The gas chamber is gold-plated, waterproof and anti-corrosion High sensitivity, low power consumption;Excellent stability Temperature compensation, excellent linear output Provide serial port (UART), analog (DAC), PWM waveform and other output methods Long service life;Anti-water vapor interference, no poisoning MH-Z14 carbon dioxide gas sensor (hereinafter referred to as the sensor) is a general intelligent small sensor that uses the principle of non-dispersive infrared (NDIR) to detect CO2 in the air. It has good selectivity and no oxygen dependence, and has a long life. Built-in temperature compensation; it also has digital output, analog output and PWM output, which is easy to use. This sensor is a high-performance sensor that closely combines mature infrared absorption gas detection technology with precise optical path design and excellent circuit design. Colour:As Shown Material:PCB style:MH-Z14A Tips: The product may be updated constantly ,Due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does Not Affect Use Package Contents: 1 * NDIR CO2 SENSOR Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.