Description:MH-Z14A CO2 gas sensor is a general intelligent small sensor, using the non-dispersive infrared (NDIR) principle to detect carbon dioxide in air, and has a good selectivity and no oxygen dependence, long service life.It has built-in temperature compensation, as well as digital output, analog output and PWM output, convenient to use.This is a high-performance sensor combined with infrared absorption gas detecting technology, precision optical path design, excellent circuit design.Features:Gas chamber adopts gold plating processing, waterproof and anti-corrosion, long service life.High sensitivity, low power consumption, excellent stability, resistant to moisture.Temperature compensation, remarkable linear output(the more CO2, the higher voltage).It provides a serial port (UART), analog (DAC) and PWM waveform output.Widely used for heating and refrigeration equipment, air purification equipment, air quality monitoring equipment, fresh air system at smart home and school.Specifications:Working Voltage: DC4-6VWorking Current: 50mA (average); 100mA(peak)Detection Range: 0-5000ppm Accuracy: 50ppmPreheat Time: 180SAnalog Output Voltage: 0.4-2V (linear output)Digital Output: Serial data output (9600, N, 8, 1)Response Time: 30SOperating Temperature: 0~60Operating Humidity: 0~90%RHStorage Temperature: -20~60Size: 5.7*3.5*1.5cm/2.24*1.38*0.59inPackage Includes:1 x Carbon Dioxide Sensor1 x Cable.