Product model number: MH-Z19B
Gas Detection: Carbon Dioxide
Supply voltage: 4.5~5.5V DC
Average current: <20mA (@5V power supply)
Peak current: 150 mA (@5V supply)
Interface level: 3.3V (5V compatible)
Measurement range: 0~10000ppm can be selected within the range
Warm-up time: 3min
Response time: T90<120s
Working temperature: 0~50°C
Operating Humidity: 0 to 95% RH (non-condensing)
https://github.com/satr/arduino-with-co2-sensor-mh-z19b-and-lcd-display-nokia-5110
https://github.com/tobiasschuerg/MH-Z-CO2-Sensors