100% brand new and high quality Features: 1. Adopting gold plating processing, it is waterproof and anti-corrosion in use with long service life. 2. Temperature compensation with remarkable linear output. 3. The higher the concentration of CO2, the higher the voltage. 4. It provides a serial port (UART), analog (DAC) and PWM waveform output. 5. Widely used for heating and refrigeration equipment, air purification equipment, air quality monitoring equipment, fresh air system at smart home and school. Specification: Type: Carbon Dioxide Sensor Working Voltage: DC4-6V Working Current: 50mA (Average), 100mA(Peak) Detection Range: 0-5000ppm Accuracy: 50ppm Preheat Time: 180s Analog Output Voltage: 0.4-2V (Linear Output) Digital Output: Serial Data Output (9600, N, 8, 1) Response Time: 30S Operating Temperature: 0-60 Operating Humidity: 0-90%RH Storage Temperature: -20-60 Size: 5.7 x 3.5 x 1.5cm(2.24 x 1.38 x 0.59in) Quantity: 1 Pc Note: 1. Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you Package includes: 1 x Carbon Dioxide Sensor 1 x Cable