1Resistance to water moisture interference, not poisoning. 2Excellent stability. High sensitivity, high resolution, low power consumption. 3Provide UART, PWM waveform and other output methods. 4Built-in temperature compensation: It has digital output and waveform output for easy use. 5The non-dispersive infrared (NDIR) principle is used to detect the presence of CO2 in the air, which has good selectivity, no oxygen dependence, and long life. Features: Resistance to water moisture interference, not poisoning. Excellent stability. High sensitivity, high resolution, low power consumption. Provide UART, PWM waveform and other output methods. Built-in temperature compensation: It has digital output and waveform output for easy use. The non-dispersive infrared (NDIR) principle is used to detect the presence of CO2 in the air, which has good selectivity, no oxygen dependence, and long life. The sensor is a high-performance sensor that combines sophisticated infrared absorption gas detection technology with precision optical circuit design and sophisticated circuit design. Specifications:Condition:100% Brand NewColor: As shown in the pictureModel:MH- Z19Main applications: HVAC and indoor air quality monitoringPackage List: 1*CO2 Sensor ModuleNote: Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.